Question

Calcule e simplifique as expressões numéricas.

A) (9/5 - 2/9) ÷ (1/8 + 1/5) . 2/3=

B) [3/4 . (2/1÷4/5-1/5)]

Answer 1

A) fazer o mmc separado
(81-10/45)÷(5+8/40)×2/3
71/45÷13/40×2/3 ( simplifica por 5)
71/9÷13/8×2/3
71/9×8/13×2/3= 1136/351

B)[ 3/4.(2/1×5/4-1/5)]

[3/4. (10/4-1/5)]
[3/4. (50-4/20)]
3/4.46/20= 69/40