《2025年通城学典计算能手三年级数学下册冀教版》

一、口算。
$\frac{1}{2}+\frac{1}{2}=$
$\frac{1}{4}+\frac{3}{4}=$
$\frac{2}{9}+\frac{7}{9}=$
$1-\frac{1}{2}=$
$1-\frac{3}{4}=$
$1-\frac{2}{9}=$
$\frac{3}{11}+\frac{8}{11}=$
$\frac{2}{7}+\frac{5}{7}=$
$\frac{1}{8}+\frac{7}{8}=$
$1-\frac{3}{11}=$
$1-\frac{5}{7}=$
$1-\frac{7}{8}=$
$\frac{11}{15}+\frac{4}{15}=$
$\frac{9}{21}+\frac{12}{21}=$
$\frac{7}{14}+\frac{7}{14}=$
$1-\frac{11}{15}=$
$1-\frac{9}{21}=$
$1-\frac{9}{14}=$
$\frac{2}{5}+\frac{3}{5}=$
$1-\frac{1}{6}=$
$\frac{3}{7}+\frac{4}{7}=$
$1-\frac{5}{8}=$
$\frac{4}{9}+\frac{5}{9}=$
$1-\frac{7}{10}=$
$\frac{4}{11}+\frac{7}{11}=$
$1-\frac{5}{6}=$
$\frac{11}{17}+\frac{6}{17}=$
$1-\frac{3}{14}=$
$\frac{3}{13}+\frac{10}{13}=$
$1-\frac{3}{5}=$

答案： 1 1 1
$\frac{1}{2}$ $\frac{1}{4}$ $\frac{7}{9}$
1 1 1
$\frac{8}{11}$ $\frac{2}{7}$ $\frac{1}{8}$
1 1 1
$\frac{4}{15}$ $\frac{12}{21}$ $\frac{5}{14}$
1 $\frac{5}{6}$ 1
$\frac{3}{8}$ 1 $\frac{3}{10}$
1 $\frac{1}{6}$ 1
$\frac{11}{14}$ 1 $\frac{2}{5}$

二、在（ ）里填上合适的数。
$1-（ ）=\frac{2}{4}$
$( )-\frac{1}{8}=\frac{7}{8}$
$\frac{3}{6}+( )=1$
$( )-\frac{1}{9}=\frac{8}{9}$
$\frac{4}{8}+( )=1$
$1-( )=\frac{3}{10}$
$\frac{2}{8}+( )=1$
$( )-\frac{3}{7}=\frac{4}{7}$
$( )+\frac{9}{10}=1$

答案： $\frac{2}{4}$ 1 $\frac{3}{6}$
1 $\frac{4}{8}$ $\frac{7}{10}$
$\frac{6}{8}$ 1 $\frac{1}{10}$