mesures i magnituds i treball lab

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    MESURES I MAGNITUDS

    +

    TREBALL AL LABORATORI

    :

    F 4 E

    E

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    A CCA

    D aac a a Ta, a a a a a ca, aba aa a a ca a a cac a a a a a a. A a cca.

    P aba a a a cac a a a aa, cc c ( cc).

    S a a ca cca bbca, ca c , a, baa aa ba cc a a.

    E ca aa :

    Dc bc

    Raa

    Cc

    D , a a a a a a a a a Ga ca a 1600 a ba cca , aca a a c a :

    E bc ca a a.

    La a ca caa a aa bc.

    Ga a a ca b a a aa a, aa baa. Qa b a ca a aa, ; a aa , cc c a aa aa .

    E ac a a a aa ccca a a:

    Obac c bc a ac. Raa ba. Ca bbca, ca.

    Pacac ac.

    Raac ac bc a.

    A a b. Cc. Eabac (cc ).

    N , a , a aba a a cac ;, a a a bac caa a aba a cc ac a ca. La cca ca, cca ca. A ca a b c , aa, a a aca, c.

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    Ha a c a a a a a cca. S a a, aa :

    A P A Cc N KGa S H La M Ma

    Paca K Da Laac Pac BM C J Wa E RDa A Va DB W

    F a ca cca bbca a a cc a cc:

    1. Ta a aa

    2.

    Ta ca

    3. Pa a aca

    4. Ta a

    5. L ca ca

    6. L aa

    7.

    La aaa

    8. Dcb a aaca

    9. L a aac a

    10.Pc aba

    11.Eab ab a

    12.

    Ic a a cca

    13.Eab a aa ca

    14.Dcb a cca

    15.L cac a aa

    16.Ta ca

    17.

    Ta caca

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    La F a cca a ca c c , a , a ca ac aca a a aa a ca.E:

    Ua a aa a ca a a c, a a ca,...

    U c ab aa caa b a aa.

    La a cca a ca c , a, a ca aac a cc ca a.E.

    U a ab a ca aa.

    U ab aaca c .

    D , c c?

    1.

    Ca b......................................................................................2. B aa........................................................................................3. A a..............................................................................4. Eca cac .....................................................5. P a a..........................................................................6. Fac aa ba.....................................................................7. Iaac..........................................................................................8. F........................................................................................9. F ba ...............................................................10.La ac aac aa.............................

    11.

    C ............................................................................12.La ac ac Sa Ma....................................................13.La ac ....................................................................14.E ca a aa ..............................................15.La a ca a a....................................................16.La aac a a..................................................................17.La aac a c b.....................18.Lbc c a a c.....................................19.La abcac aa c....................................................20.Ra............................................................................................

    21.

    La cb cbb ....................................22.Ec....................................................................................................

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    AD

    A a a ca aa .

    Ua a a. A a

    ........................................................................................................................................................................................................................................................................................

    P a ca a ba a a?

    ............................................................................................................................................

    ..................................................................................................................

    E . E aca .

    L a caca :

    L a caa a..................................................................................................................................................................................................................................................................................................................................

    L a ca a................................................................................................................................................................................................................................................................................................................................

    L a ca aa EC.U c ................................................................................. ca ..............................................................................................................................................................................................................................

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    L a ab caca : .

    L a aa a............................................................................................................................................................................................................................................................................................................................

    L a a a .............................................................................................................................................................................................................................................................................................................................., c a c, , a a, ca, c.

    La a ac ab a aa :

    Sc:

    V:

    Da:

    Vca:

    Accac:

    P:

    L a ab caca .

    L a a aa aa, c aaa, ,..., a a aa aac a aa, a, , c.

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    EA DA

    E c a a aa a, aba, a c .

    P a a a:

    1 E a aa.2 E a caa ca a a a

    aa, a , a aa.3 Eab ac a a a.

    E a a, ba c a a ca cca, , aa a Cca Ga P M a U Ea. A c 7 a aa

    c a a.

    Ma aa Ua aa

    L c a b SI :

    E a ac

    c b a a 1/299 792458 .

    a aa E () a a aaa aca

    a.

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    E () a aa 9 192631 770 a aacc a a ac 'a

    aa ' c133.

    a A Ia c cc

    L'(A) a a 'c ca a cc aa,c, a, cc cca b aa a ca ' ' 'a b, a a

    a a a 2107 .

    K Taaca

    E(K) a acc 1/273,16 a aaca aa.

    caa c Ia a La (c) a aa, a cc

    aa, 'a aaac cca ca 5401012 aa ca a a aa cc 1/683a aa.

    Qaa bca E () a aa bca ' a c a a a

    c a 0,012a cab 12.

    L a a a Sa Iaca b a a a cbac a a aa a . A aaa c a ba a c ab a aa SI.

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    Sc aa 2

    V cbc 3

    Vca /

    Accac a aa /2

    A aa a

    Vca aa aa a/

    L a

    Fca H

    P

    Fa, , N

    Ea, ca, ba J

    Pca a W

    Ca cca cb C

    Gaa a N/

    Ca cc cb N/C

    Pca cc V

    Rca cca Da a cbc K/3

    P aca Pa

    Qaa a K/

    I a N

    M b a a bca:

    P Sb Va c

    TaGa

    Ma

    Q

    HcDca

    Ua

    Dc

    CM

    McNa

    Pc

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    EE

    La ca a ca, c a cc a, ba a ac a, a , a c a.

    E a a aa ca a c a a a: 5 , 90 /, 25C.

    La a ca, a c b:

    H a : .

    L c a ...........................................................................................................................

    L c a ........................................................................................................................

    ) Eca ab a c a a aa aa

    a aa a. F a ac a aa cc.

    )

    Eca ab a c a a a a ca caca.

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    E E E EE

    L a a ab a aa.

    La aa a aa a a. C a

    b , caa caca.

    La ba 1 .La ba a baaa aba ...............

    La ca a a caaca a a a a a aa a a aa a.

    U a a a a a a a.

    U a c, c ac c abcac. P , a aa a caba a a c ( a a ), cac.

    A a :

    Ca ca....................................a.............................. Caba ( ) ....................a..............................

    Pa.............................................a.............................. C.......................................a............................. Baaa.............................................a............................. T......................................a............................. A.....................................a............................. V.........................................a............................. Da....................................a............................. F.........................................a............................ A.....................................a............................. Ma........................................a............................

    Ba.........................................a............................. T......................................a............................

    S aa a a a aab (a) b a ac, a aca a c .

    L ca caca . Pcca a ac a,

    a , a a.

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    Daa baa, ab . E c a a a, acca a aaa cab ca.

    Ua cacac a :

    ERRORS PERSONALS: S c ca a a aa a a. E a c acca. Sc a a c ca, aba a aa b a caa aaca ( aaa) a cca aa a. E acca c a a a ca a aa a, a aa aa caa , c.

    ERRORS DE PROCEDIMENT: S c a aca c aa.

    ERRORS INSTRUMENTALS: A a a cc aa a. A a a aca c aa a c cabac. S c.

    P a ca acca a a a aa c a a a aa aca ab.

    P a a ca aa aa b ba b a a ab aa.

    Qa aa a a a ca a c. A, :

    E AB: a ca, a ab, a ba () a ac ().

    Ea=

    Qa a c a a aca a aaaca . L ab aa a caca a caa a. L ab a a.

    L a a : ( E)

    U a ab c a a a ba a. P , a a 'a 'a a aca ab

    1 , ca 'a a ba a; aa b, 'a'a abac ab a b a .

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    E EA: c ab a ac aa. L a a a %.

    100=m

    EaEr

    L a a : ( E(%) )

    L a a a c a a caa a c .

    L () a a a ca aa. Ea a aca a a a c.

    P , a a caa ab caba 7,3 , aa caa aca c , b baca a a c.

    L a a ca: T a a a ca.

    P , 14,32 4 . E aa a a a a ca ca. P ,

    21,00 c3c 4 .

    E a c b c ca. P a a 0,0340 a ca c 3.

    E a b ca ca ca,c ca a ab . A, a a 540 c 2, 540. .

    E a ca a caa F1 M aa a a , , 45,4 ; 44,8 ; 45,7 ; 46,5 45,0. R a :

    a) Q a ca ?

    ) Caca ab a a a a acca.

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    M a aa a a a c b a :

    La a a aa (60,0 0,1) .

    E c a aa (1,30103 10) .D a a a ca.

    V caca a a ab. P b a a aaaa a baaa, aa aa a a.R a ac a b a:

    () 12,54 12,57 12,49 12,60 12,58 12,52

    V(c3) 4,28 4,32 4,26 4,25 4,42 4,34

    a)

    Caca a aa a a.b) Caca a a aa /c3, /3 a Sa

    aca.c) Caca ab a aca a a a a aa

    .

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    E a a aa a a Ta 9,81 /2. S a aa 10, ab a ?.

    ***Pcca 1: M a

    :Ma a a a ca a a(ca ca)

    :P C ac

    C aBaaa ccaPa

    E a ab a a aa () (2R) caac.

    Aa (c) D (c)

    E c caca ca a a ba aa: hRV =2

    Aa (c) Ra (c) V (c3)

    C ac

    C a

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    Ra a a aa a a.

    V ca (c3) V a (c3) V (c3)

    C ac

    C a

    M a aa ab a baaa cca.

    Maa ()

    C ac

    C a

    Aa cac a a aa c ab cacaa a ab , ab caca ab aa.

    =

    3cm

    g

    volum

    massad

    Da (/c3)( )

    Da (/c3)(a)

    C ac

    C a

    La a a a ......................... a aa aa.

    C 7,85 /3.C 2,70 /3.

    Cac, aa, ab a . Qa a aca?

    E ab( )

    E a( )

    E ab(a)

    E a(a)

    C ac

    C a

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    Ca a a cca aaa, ac :

    Paa, c a cca, aa aac

    a c Obc a cca Fa c, c cc a cca Maa Pc Da Cc Cc Bbaa

    EAC EE AABE

    Qa a aa, a a aa ac .L a aa aab.

    A, , aca c a aab

    a ca a a c, a a ca, a a ,...

    E c a aa a c........................................................................................................................................................................................................................................................................................................................................................................................................................

    ........................................................................................

    E aa a ...........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

    A a a a ca aab a ca ca a

    ca.

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    E : Vaab : S a a a

    baa a ca ca aab .

    Vaab : S a ba caa aab .

    Vaab ca: S a ca a ca caa a ca aab .

    E Vaab

    Vaab

    Vaab

    ca1 Ica c

    c a aca.

    2 Ica a aa a a a

    c.

    3 Ica a aa a c a aa.

    4 Rac ca a a ca.

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    U c aa , ca aaa a a ac a aab a aab . Aa ac aaa a (a aca).

    P a aa ca a a ca a b. E a a aab abc (X) a aab a (Y).

    E c a a c, a :

    Ma ca ca:

    Ma a ca:

    Ma ab ac aca:

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    U a a a ac a A B, b a :

    A 2,3 6,4 8,7 9,2B 5,3 14,7 20,0 21,2

    a) Ra ca a.b) Qa a a ca ?c) La aa A B a ca

    ca. c ?

    U cc aca a ca ca a cc cc a a a c cc. Rc a b a aa:

    V(V) 0 2,2 5,3 7,2 10,0 13,0 14,4 18,0 19,6

    I(A) 0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8

    Tba a ca aca a.

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    FAC DE CE

    E aca a aa a a aa a. Ec ca baa a ca a aa a a aa a acc a a a ca a a aa a, a a a a a aba; cc aca a a a c a aca a a.

    [ ] [ ] finalunitatinicialunitat

    finalunitatinicialunitat =

    Eca ca a , a .

    a) 0,025 a

    b) 35 2a 2

    c) 120 / a /

    ) 25 / a /

    ) 11200 / a /

    ) 20 / a /

    ) 120 / a /

    ) 0,5 /2a /2

    )

    12 3a c3

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    CE, FAE!!!!!!

    La a aa Sa Iaca a () a.

    Rca a a caaca a a aca ab aa Sa Iaca 1 3 = 103 L.

    L ab , a caca a ab, a (a aa a a).

    Qa aa a a a c, acaa a a aa: 1 T2 = (1012)22= 1024 2. Qa aca ,

    aca a a a cb: 1 3

    = (102

    )3

    c3

    = 106

    c3

    .

    Qa a ca aba a , a a caca a a .

    P caa a c a caa a(ca caa a) ab.

    Qa ca aab ca , b ca b caa a a aa a aa a.

    ACA EE AD

    1. D , ab c c c.

    2. Caca c c.Cb cab B aaRacc a Caa a aPacc a Iaac a baa caFac a RacEc Oac ca

    3. D a.

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    2

    4. Ca 4 a c a ca ab aa a a.

    5. Maca cc a :A OEac VcaDa EaaV

    6. Caca a caa ca:o To

    Fao Vcao Maa

    7. Eca Sa Iaca a ca aaa a.

    8. Caca a, a aa a :

    Ca ca , , c, ca, a, , ,, a, aa, ca, , aa, a, .

    Ma Ua Aa a

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    9. Ea a SI ab ac cca aa :

    a) 23

    b)

    45 MA

    c) 15

    ) 5 A

    ) 8,3

    ) 0,25

    10.La a a a aaa TFT a 480 c/c2.Ica a a c/c2 c/2.

    11.Ea a Sa Iaca :

    126h

    km

    300min

    hL

    12.Ica a ca a a a 0,310 .

    13.A a aa a 34,562 a 3 ca.

    14.Laa a a aa a 120 a. Qa a ac cca ?.

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    15.E c a La a a a Ta 27,31 .

    Caca a ac cca.

    16.La aa 1,671027 . Qa a aa aa ca ?.

    17.Qa a ca? Jca a a a.

    a) (7,5 0,25)

    b) (251,7 2,3)

    c) (14,2 0,5) K

    ) (76,5 2,5) L

    18.Oa a a a aa :

    a) 1,5 a; 2105Pa 1 710 H

    b) 2,65 J ; 0,25 ca 2,6104ca

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    19.E aba a a a ca a ba ac

    a ca. P ba a b a: 2,0 ; 2,2 ; 2,2 ; 1,9 ; 2,0 ; 2,3 ; 2,2 2,0 . Ea a a a c ab a.

    20.E aba a a a b c ab a ( ): 2,45; 2,44; 2,42; 2,43; 2,40; 2,20;2,45; 2,42; 2,44 2,45. Ea a c .

    21.D :c) Ua 10 c ab ab 4 ) U 25 c3ab ab 2 c3

    Ica a a a ca. Jca a a aaca.

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    22.Raa aca a ac c:

    a) L ab a ca 90 c.1. Caca aaca .1.

    b) L ca ab a ca 4 .1. Caca aa ca .1.

    c) La ca AVE 300 .1. Bca aa ca a.1.

    ) La a c 13,6 /c3. Bca aa a .1.

    ) La a a a 4 .1. Ea aa a .1.

    ) L aa a La a a 400 caa 2 (400 .2).Ea aa aa .c2.

    ) La a a c caa aca a a

    a. La a a a a 130000 a/. Ea aaaa M/ ( a caa a).

    ) U a a a ca 70 a/2. Ea aaa /2.

    )

    E c a 2500 .1

    a cca ab aca 108 .1. Caca a aaa c caa c .

    A a b acca:://cacaa.//3/cc/cc1.

    ://.a./aa/a01a

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    E

    La ca a baca a cca a caac bc

    ca baa ab a, aaac aa bc a a a ca. Laca a a aa aa ab a .

    E c ba c a, a, b c, bc a a a a ab, c cca aa c a . E a, aca a a ca a a a.

    Q aa a acac c? Maa , a ca aca cca a aa a caaa a caa cc.

    S aa aa aa :

    A ca! N .

    Aa ba ca! Q b?

    A b! T ca c c , a, c !

    E a cac a aba a acca a aaa aa cca caa, bca a, aab a caac aa.

    Sba , c, a ca a aa . P, aa aa aa!

    E cb c a a a a a cac : a, c, a a, abc, c, aba ca a.

    La ca cb ab cc :ca, ca, ba, aa, aca, aa, a,aa,

    Ta a aa a aa c c acc c.

    La ca ca b caac .

    La ca a a ca a a ba ca, c,a aa, , a caa a.

    S a ca, a c. La cca, a ca, c a , ca.

    La ca baa cb aa, ca, c a aa c ac b a aa a.

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    P a a a, ca c aa aa cca aaa , ca, ccaa a a a .

    L c aa a c ba a aa cc: cc.

    L aa a cca.

    Ec a a ba aba acc c a, caca aa ac a a ( ca), aa a aa

    a b, c.

    Sa aa a aba ab:

    A a. P a.

    C ca .

    Ha caa ab aa a cca a aa.

    Aa a a b a ba aba. a c : ca c, ca a, bc c c, c. L a a a c .

    L aac a ba aba a a aa a cca.

    Rca a aba.

    Ca a b a cc (aaa b ca).

    Raa a cca, aac cc.

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    1. E aba, ca baa ab aa, c; a a c a, a aaa a acc c a a baa aba a a ba

    a, a a a.

    2. E ba a aaa c a a a c aca b cca, a a a a aaa c .

    3. Sa aa c ab c c a a c a ba. E aaa ab a ca, ca a a. E , a ab a , a a acc.

    4. L acc a cc a c a a aa ab ac ca.

    5. P a b c, ca c aab c ac,, c, c, ac a c.

    6. L ca a aca b, aaa a aa, ab .

    7.

    P a , caa b aa, c a, a aca a a aa aa caa caa. Ma a a bca b ca a a caa.

    8. Ca baa ab aa ab c, ca. S a ca ca a aa , a c /a ca .

    9. N a a a c ac a aa a c a, a , b, a ba ca ca

    acc .

    10.N a a a b a a ca.

    11.E ca ab aa ca.

    12.Sa aa c c ab cac, . Na a ca c c c a, /a ac.

    13.Qa acaba ca, a a a aa a ba. Ca, ab, a a.

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    Caa a a a aba c. Pa , a, ca ab a a a a aac c c. P aa a, a c

    c ca a a a ac aa a aaa.

    A a 1 b 2010, a ba a caca,a aa c c a a ca ab , caa , a c, ac a 2015.

    E AC CAE:

    Tc F + M c F+ M aab

    O Cb C C

    E E NP a ab

    Xn NociuXi Irritant

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    E CAE b ab a b, ab a a a bac, b a ( aa a ab a aa). S :

    E: a b a bba a aa c a cac ab a aa, a, cca ca, ac a ca, cac ab a c, a, c, cc, c.

    E a a a, c a a, a a acaba, b 50 C.

    FAABE: c ca a ca a c, a 0 C, cac ab a aa, a, ccaca, c.), ca cc, cac ab a aa, ab aaab. Lac, a, a a a a ca, aca, a, a , a , ca a, c., aab.

    CBE: a ca caa a caab, a aa a b cc. E a aa c aa c cb. S c c cac ab a

    bc, b aab, ca, aa aa c a. E c , c c acc, cb.

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    A: b a bba aaa aba . A a ab a ca, c a c, a . E a a caa ca c a a baa aa. E a aa aa b a ac c, a a a .

    C: c aaca a caaa b a a , a , ca cac cc.

    CA ADA: a caaa b caa c a c a a a a, , ab cc a. E a cac , , a ca, a c. E ca , caa a.

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    AC CA: caac a c a c ca a. Aa cc a ac , a, a , ac, ca .

    E E AAC: a c abaa a aac caa c a , ca, a a . P ca c cac, (ADN c a a a aa a a cca), c a a cc, caa c a c a, a a, ca

    a aac, ca ca c a, c , a , c., ca c b caa a.

    E E A ED ABE AC: a caaab ab ca c ca c a aa ac (, cac, a, a a a, c.).La cacac caa c c ab b ca a a c caa c b a caa .

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    C ba a aa aa a bc aba c , a aa a aa ac :

    Pca aca aa a a aa c c. Taaca, ba ba acc.

    P aab.

    Tab a a caa, aa, caa aa a a a aa ac c.

    cb a ba a a aba, a ca a, a a a ac c a a .

    Ua aa caca aa aba :

    DISSSENYATS PER MESURAR VOLUMS DE LQUIDS

    1. Ma aa: Rc ab a c a a a a a a a caaca. Sa aa c ccacca.

    2. Pa aaa: Rc aa a b a

    aa a. Na a aac .

    3. Ba aaa: Rc aa a b a a a a ca a a . La a a aab a aaac, a ca, aba a c . Sa .E ca a a ba a.

    4. Pa: I a b a a ab a c. P , a a

    aa, cca . N a : Aaa, a a aca c .

    Gaaa, a aa aca.

    DISSENYATS PER BARREJAR I ESCALFAR

    5. Va ca: Rc cc ab bc. a aba. Sa , caa, baa, a,

    acca,...Qa a aa, a aaaa. N a , a, caaca.

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    6. E: Rc a c c aa .Sa caa c, b, a ab aba a . P a aa.

    7. Tb aa: E a a a aa ,

    a, ab aa .

    8. Ma: Rc a ca ab c. P a. S caa c . aa bc ac acc ca caa cca ab a aa, a aa a b b ca.

    9. Ca caa: Rc caa bc aa a c a.

    10.

    G: Rc caa bc a a a c a.

    ALTRE UTILLATGE

    11.Eb a aaa: I a aa .

    12.Eb Bc: Aa a a aa a a b.

    13.

    Eb caac: S aa cb.

    14.Aa : S cca ab a a.

    15.Ra: Aa a ac acc a c .

    16.Caa ac: S cca a ab a ac.

    17.

    Cc ca: P c c b.

    18.Ca V: S a ac accaa.

    19.Vaa : S a.

    20.V : a aa , ba aa.

    21.

    Caa: S caac.

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    22.T: I a a a aa.

    23.Ca P: I a a c bc.

    24.M: Aa a a c.

    25.Dca b: S aca ca a bc.

    26.Fac a: S c aa.

    27.G ca: E a aa .

    28.Kaa: Rc a c a ac a b.

    29.

    Tb : A a a acc.

    30.Baaa: I a aa. Aca baac a ab c , c .

    31.Ea: E aaa c . N a , aca a a ca.

    32.Ta: P , c, aa , a acc.

    33.Bc a (bc B): F ca.

    34.Pa : Maa ab a c ac . Sa a ac.

    35.S: A a ac, ac, acc, c.

    36.T : E c bca aa caa.

    37.Cc: S bca b a ac.

    38.Gaa a b aa

    39.Pabc: c a bc a a acaac a.

    40.N b: A a a.

    41.

    Pa: E bca aa, b, b, c, a.

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    42.Ta aca: E bca caa

    .

    43.Ra: aca aa aca cac c a

    aa b c caa.

    ://ca.c./aa//.?a=1

    A cac, aa b a aba a.

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    ACA EBA A ABA

    http://clic.xtec.cat/db/act_ca.jsp?id=1053

    A

    1. Aa ca cc, a a a aa cca aca caa ca:

    a) Qa a aba, a b ca a a a aa b a a a aac c aa.

    b) LAa , a a a, aaa ab a b aa caa ab a aa bc B, ca ca ca cca.

    c) La Ja a Laa a aa a c a c c, ac a a c cca. P aaa a a c ab a bca aa a aa ca.

    ) LHa P a a a acc ca a a a a a c, a a aba cc a baa.

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    ) La Paa R a acaba a cca c a ba aca c. P aa, c a ac ba ac a.

    ) Da a aac a cca aba, a Na a Ca b a a caa a cab a aa c. Q c a a ?

    ) E S ca caa a 50 C c c a,

    aab. C aa a aba?

    B

    1. Qa ac a aba ' aa , aca c , caac ca 'a aba

    c. Ca a aa :

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    2. Q aa c ca a abac 9,5 L aa? Ra .

    a) a aa 10 L

    b) a aaa 10 L

    c) a aaa 10 L

    ) a ca

    3. O a b:

    a) S a ca aa , a aa ab ................................................

    b) P aaa aa c c a a a....................................................

    c) S caa a a bca c a

    ................................................

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    ) P aa ac a b a aba c a .................. b .......................

    ) La ....................... a b aa ab a ca a a aa a aba.

    ) P aa a ac c ca a a................................................

    ) E .............................. aa a a a aca bc.

    ) Qa a a aa a bca a ab a baaa a a a b a .......................... a ba ab a a baaa.

    ) La .............................. ........................ a caa aa caa a a a.

    C

    1. E a c aaa a (KMO4)aa ca :

    a) Q ca a ca?

    b) Q cac ca aa aaa a?

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    2. Lc ac (c acc) c c b. Aa ca a a a aa c ac cca:

    a) E ca A, B C

    b) Ca a ca

    c)

    E caa A

    ) E ca A B

    Aa ca ca B, C D a a a:

    a) Iaab, aac cb

    b) E, ac ca cb

    c) Cb, ac ca

    ) Iaab, ca aa c

    3. I ca ac a aa c c c cca (HF (a)):

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    4. M c c c bc a ca a b a a a cac ca aa.Bca a caa a c a a a ca a ca a aa :