Tính:-1 2/3+3/4-1/2+2 1/6

* Hướng dẫn giải

$-1\frac{2}{3}+\frac{3}{4}-\frac{1}{2}+2\frac{1}{6}=\frac{-5}{3}+\frac{3}{4}-\frac{1}{2}+\frac{13}{6}=\frac{-20}{12}+\frac{9}{12}-\frac{6}{12}+\frac{26}{12}=\frac{3}{4}$