Tìm x a) 4/5 x = 4/7 b) 3/4 : x =1/2 c) x : 8/11 =11/3

* Hướng dẫn giải

a)

$\begin{array}{l}\frac{4}{5}.x=\frac{4}{7}\\ x=\frac{4}{7}:\frac{4}{5}\\ x=\frac{4}{7}.\frac{5}{4}\\ x=\frac{5}{7}\end{array}$

b) 

$\begin{array}{l}\frac{3}{4}:x=\frac{1}{2}\\ x=\frac{3}{4}:\frac{1}{2}\\ x=\frac{3}{4}.2\\ x=\frac{3}{2}\end{array}$

c) 

$\begin{array}{l}x:\frac{8}{11}=\frac{11}{3}\\ x=\frac{11}{3}.\frac{8}{11}\\ x=\frac{8}{3}\end{array}$