Question

Gía trị của x thỏa mãn đẳng thức −2/3 .x=4/5 là:
a) 6/5 b)−5/6 c)−6/5 d)5/6

Answer 1

Ta có: \(\dfrac{-2}{3}\). x = \(\dfrac{4}{5}\)

=> x = \(\dfrac{4}{5}\): \(\dfrac{-2}{3}\)= \(\dfrac{4}{5}\). \(\dfrac{-3}{2}\)= \(\dfrac{4.\left(-3\right)}{5.2}\)= \(\dfrac{2.\left(-3\right)}{5.1}\)

=> x = \(\dfrac{-6}{5}\)

Vậy: ta chọn c) \(\dfrac{-6}{5}\)