Tìm x a) 8/23 . 46/24 - x = 1/3 b) 1 - x = 49/65 . 5/7

* Hướng dẫn giải

a) 

$\begin{array}{l}\frac{8}{23}.\frac{46}{24}-x=\frac{1}{3}\\ \frac{2}{3}-x=\frac{1}{3}\\ x=\frac{2}{3}-\frac{1}{3}\\ x=\frac{1}{3}\end{array}$

b)

$\begin{array}{l}1-x=\frac{49}{65}.\frac{5}{7}\\ 1-x=\frac{7}{13}\\ x=1-\frac{7}{13}\\ x=\frac{6}{13}\end{array}$