《2025年心算口算巧算三年级下册北师大版》

口算。
$\frac{2}{5}+\frac{1}{5}=$
$\frac{3}{4}+\frac{1}{4}=$
$\frac{5}{6}+\frac{1}{6}=$
$\frac{2}{7}+\frac{3}{7}=$
$\frac{1}{6}+\frac{1}{6}=$
$\frac{2}{8}+\frac{3}{8}=$
$1-\frac{5}{6}=$
$\frac{3}{10}+\frac{7}{10}=$
$\frac{8}{9}-\frac{2}{9}=$
$\frac{4}{7}+\frac{2}{7}=$
$\frac{9}{10}-\frac{3}{10}=$
$\frac{7}{8}-\frac{5}{8}=$
$1-\frac{1}{2}=$
$\frac{3}{4}-\frac{1}{4}=$
$\frac{4}{9}-\frac{1}{9}=$
$\frac{1}{2}+\frac{1}{2}=$
$\frac{1}{3}+\frac{1}{3}=$
$\frac{4}{5}-\frac{1}{5}=$
$1-\frac{3}{5}=$
$\frac{3}{7}+\frac{1}{7}=$
$\frac{8}{9}-\frac{5}{9}=$
$\frac{1}{9}+\frac{5}{9}=$
$\frac{3}{8}+\frac{5}{8}=$
$1-\frac{1}{4}=$
$\frac{1}{8}+\frac{4}{8}=$
$1-\frac{3}{10}=$
$1-\frac{4}{5}=$
$\frac{5}{7}-\frac{3}{7}=$
$\frac{2}{5}-\frac{2}{5}=$
$\frac{2}{8}+\frac{4}{8}=$
$\frac{2}{6}+\frac{3}{6}=$
$1-\frac{1}{13}=$
$\frac{1}{18}+\frac{1}{18}=$
$1-\frac{2}{6}=$
$\frac{11}{17}-\frac{2}{17}=$
$1-\frac{2}{7}=$

答案： $\frac{3}{5}$
1
1
$\frac{5}{7}$
$\frac{2}{6}$
$\frac{5}{8}$
$\frac{1}{6}$
1
$\frac{6}{9}$
$\frac{6}{7}$
$\frac{6}{10}$
$\frac{2}{8}$
$\frac{1}{2}$
$\frac{2}{4}$
$\frac{3}{9}$
1
$\frac{2}{3}$
$\frac{3}{5}$
$\frac{2}{5}$
$\frac{4}{7}$
$\frac{3}{9}$
$\frac{6}{9}$
1
$\frac{3}{4}$
$\frac{5}{8}$
$\frac{7}{10}$
$\frac{1}{5}$
$\frac{2}{7}$
0
$\frac{6}{8}$
$\frac{5}{6}$
$\frac{12}{13}$
$\frac{2}{18}$
$\frac{4}{6}$
$\frac{9}{17}$
$\frac{5}{7}$