异分母分数加减法20道

加法题目

$\frac{1}{2} + \frac{1}{3}$

$\frac{1}{4} + \frac{2}{5}$

$\frac{3}{7} + \frac{1}{5}$

$\frac{2}{3} + \frac{3}{8}$

$\frac{4}{9} + \frac{1}{6}$

$\frac{5}{8} + \frac{2}{7}$

$\frac{3}{5} + \frac{3}{10}$

$\frac{7}{12} + \frac{1}{4}$

$\frac{5}{9} + \frac{3}{7}$

$\frac{1}{3} + \frac{5}{11}$

减法题目

$\frac{5}{6} - \frac{2}{3}$

$\frac{7}{8} - \frac{3}{4}$

$\frac{4}{5} - \frac{1}{3}$

$\frac{9}{10} - \frac{2}{5}$

$\frac{8}{9} - \frac{1}{6}$

$\frac{7}{10} - \frac{3}{7}$

$\frac{6}{7} - \frac{2}{5}$

$\frac{5}{8} - \frac{1}{4}$

$\frac{7}{9} - \frac{2}{7}$

$\frac{4}{11} - \frac{1}{5}$