Tìm x a) x - 10/3 = 7/15 . 3/5 b) x + 3/22 = 27/121 . 11/9

* Hướng dẫn giải

a)

$\begin{array}{l}x-\frac{10}{3}=\frac{7}{15}.\frac{3}{5}\\ x-\frac{10}{3}=\frac{7}{25}\\ x=\frac{7}{25}+\frac{10}{3}\\ x=\frac{271}{75}\end{array}$

b)

$\begin{array}{l}x+\frac{3}{22}=\frac{27}{121}.\frac{11}{9}\\ x+\frac{3}{22}=\frac{3}{11}\\ x=\frac{3}{11}-\frac{3}{22}\\ x=\frac{3}{22}\end{array}$