Question

a) (4/3-1):2/3=
b) 6/7+(1/2-2/5)×5

Answer 1

a)    4       1           2                        4   -    3          3

 (---- - ------) : -------- =                ( ------------ ) . ------- =  logo

   3        1           3                               3               2

      1        3          3         1

      ---- . ------ = ------- = -------        

       3       2           6         2

.........................................................................................................................
b)  6/7 + (1/2 - 2/5) × 5

6/7 + (5 - 4/10) × 5

6/7 + 1/10 × 5

6/7 + 1/2==>mmc =7.2 =14

12 + 7/14

19/14

Resposta: 19/14




foi mal ae tinha confudido

Answer 2

Resposta:

Explicação passo a passo:

a)

(4/3-1):2/3=

(4/3-1/1):2/3=      , faça o mmc(3,1) = 3 e resolva (4/3-1/1)

[(3÷3)×4-(3÷1)×1]/3:2/3=

[1×4-3×1]/3:2/3=

[4-3]/3:2/3=

1/3:2/3=              , inverter 2/1 por (1/2) e multiplicar

1/3×(1/2)/3=        

1/6/3=               , inverter 3/1 por 1/3 e multiplicar

1/6×(1/3) =

1/18

b)

6/7+(1/2-2/5)×5 = , faça o mmc(2,5) e resolva (1/2-2/5)

mmc(2,5)

2,5 | 2

1,5 | 5

1,1 | 1

mmc(2,5) = 2×5 = 10

6/7+[(10÷2)×1-(10÷5)×2]/10×5 =

6/7+[5×1-2×2]/10×5 =

6/7+[5-4]/10×5 = , observe que 5/10 = 5÷5/10÷5 =1/2

6/7 + 1×1/2 =

6/7 + 1/2 =    , faça o mmc (2,7) e resolva 6/7 + 1/2

mmc(2,7)

2,7 | 2

1,7 | 7

1,1 | 1

mmc(2,7) = 2×7 = 14

[(14÷7)×6 + (14÷2)×1]/14 =

[2×6 +7×1]/14 =

[12 + 7]/14 =

19/14