Tìm x, biết: a) x + 1/2 = -6/5 . 3/4 b) 2/5 + x = (-5)^2 . 3/5 c) x - 17/36

* Hướng dẫn giải

$\begin{array}{l}a)x+\frac{1}{2}\text{=}\frac{-6}{5}.\frac{3}{4}\\ x+\frac{1}{2}\text{=}\frac{-9}{10}\\ x\text{=}\frac{-9}{10}-\frac{1}{2}\\ x\text{=}\frac{-7}{5}\end{array}$

$\begin{array}{l}b)\frac{2}{5}\text{+}x={\left(-5\right)}^2\text{.}\frac{3}{5}\\ \frac{2}{5}\text{+}x=15\\ x=\frac{73}{5}\end{array}$

$\begin{array}{l}c)x-\frac{17}{36}\text{=}\frac{-15}{16}\text{.}\frac{4}{27}\\ x-\frac{17}{36}\text{=}\frac{-5}{36}\\ x=\frac{-5}{36}+\frac{17}{36}\\ x=\frac{1}{3}\end{array}$