Tính a) 2/3 - 5/7 . 14/25 b) (4 - 5/12) : 3 + 7/36

* Hướng dẫn giải

a) $\frac{2}{3}-\frac{5}{7}.\frac{14}{25}=\frac{2}{3}-\frac{2}{5}=\frac{4}{5}$

b) $\left(4-\frac{5}{12}\right):3+\frac{7}{36}=\frac{43}{12}:3+\frac{7}{36}=\frac{43}{36}+\frac{7}{36}=\frac{25}{18}$