Question

24) Resolva as expressões numéricas:
.
a) ( - 11/5)÷[(-5) - (+1/2)] =
b) (- 4/9)×(-18/10)-(-1/7)÷(+1/35) =​

Answer 1

Resposta:

a) 2/5; b) 29/5.

Explicação passo a passo:

a) (-11/5) : [(-5) - (+1/2)] =

(-11/5) : [- 5 - 1/2)] =

Igualando os denominadores:

(-11/5) : [-10/2 - 1/2] =

- 11/5 : [-11/2] =

- 11/5 x [-2/11] =

22/55 = 2/5.

b) (-4/9) × (-18/10) - (-1/7) ÷ (+1/35) =​

72/90 - (-1/7) x 35/1 =

72/90 - (- 35/7) =

72/90 + 35/7 =

Igualando os denominadores:

504/630 + 3.150/630 =

3.654/630 = 29/5.  [MDC(3.654 e 630) = 126]