Question

Calcule o valor das expressões .a) 12-5 :(-4/3)=b) 3/7×(-7/5) -5/8 :(-5/2)=c) (-4/9+1/15):(5/6-1/9)=d) (

Answer 1

Resposta:

a) -9/5; b) -17/20; c) -34/65.

Explicação passo a passo:

a) 12/5 : (-4/3) =

12/5 x (-3/4) =

- 36/20 = - 9/5.

b) 3/7 x (-7/5) - (5/8 : (- 5/2) =

- 21/35 - 5/8 x (-2/5) =

- 21/35 + 10/40 =

- 3/5 + 1/4 =

Igualando os denominadores:

- 12/20 + 5/20 =

- 17/20.

c) (-4/9 + 1/15) : (5/6 - 1/9) =

Igualando os denominadores:

(- 20/45 + 3/45) : (15/18 - 2/18) =

- 17/45 : 13/18 =

- 17/45 x 18/13 =

- 306/585 =  - 34/65.