Tìm x a) x + 1/2 = -4/5 b) -3/4 -x = 2/3 c) 2 3/5 + -3

* Hướng dẫn giải

$\begin{array}{l}a)x=\frac{-4}{5}-\frac{1}{2}\iff x=\frac{-13}{10}\\ b)x=\frac{-3}{4}-\frac{2}{3}\iff x=\frac{-17}{12}\\ c)\frac{-3}{5}:x=\frac{-2}{3}-2\frac{3}{5}\iff \frac{-3}{5}:x=\frac{-49}{15}\\ \iff x=\frac{-3}{5}:\frac{-49}{15}\iff x=\frac{9}{49}\end{array}$