Tính 5/8 +2 1/4.1 2/3 -1/4.5/6

* Hướng dẫn giải

$\frac{5}{8}+2\frac{1}{4}.1\frac{2}{3}-\frac{1}{4}.\frac{5}{6}=\frac{5}{8}+\frac{9}{4}.\frac{5}{3}-\frac{5}{24}=\frac{5}{4}.\left(\frac{1}{2}+3-\frac{1}{6}\right)=\frac{5}{4}.\frac{10}{3}=\frac{25}{6}$