Tính:7/12-(-1/5)-5/6+2/3+(-1/5)

* Hướng dẫn giải

$\frac{7}{12}-\left(-\frac{1}{5}\right)-\frac{5}{6}+\frac{2}{3}+\left(-\frac{1}{5}\right)=\frac{7}{12}+\frac{1}{5}-\frac{5}{6}+\frac{2}{3}-\frac{1}{5}=\frac{7}{12}-\frac{10}{12}+\frac{8}{12}=\frac{5}{12}$