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一、直接写出得数。
$\frac{8}{9} - \frac{4}{9} =$
$\frac{4}{5} - \frac{1}{5} =$
$\frac{9}{10} - \frac{3}{10} =$
$\frac{5}{9} - \frac{2}{9} =$
$\frac{6}{8} - \frac{3}{8} =$
$\frac{17}{29} - \frac{9}{29} =$
$\frac{11}{21} - \frac{6}{21} =$
$\frac{7}{10} - \frac{6}{10} =$
$\frac{3}{6} - \frac{2}{6} =$
$\frac{11}{30} - \frac{9}{30} =$
$\frac{19}{22} - \frac{9}{22} =$
$\frac{2}{4} - \frac{1}{4} =$
$\frac{3}{7} - \frac{2}{7} =$
$\frac{3}{4} - \frac{1}{4} =$
$\frac{11}{13} - \frac{3}{13} =$
$\frac{4}{7} - \frac{2}{7} =$
$\frac{9}{10} - \frac{7}{10} =$
$\frac{5}{6} - \frac{1}{6} =$
$\frac{18}{19} - \frac{3}{19} =$
$\frac{5}{8} - \frac{1}{8} =$
$\frac{2}{3} - \frac{1}{3} =$
$\frac{23}{30} - \frac{7}{30} =$
$\frac{14}{15} - \frac{13}{15} =$
$\frac{3}{5} - \frac{1}{5} =$
$\frac{8}{9} - \frac{4}{9} =$
$\frac{4}{5} - \frac{1}{5} =$
$\frac{9}{10} - \frac{3}{10} =$
$\frac{5}{9} - \frac{2}{9} =$
$\frac{6}{8} - \frac{3}{8} =$
$\frac{17}{29} - \frac{9}{29} =$
$\frac{11}{21} - \frac{6}{21} =$
$\frac{7}{10} - \frac{6}{10} =$
$\frac{3}{6} - \frac{2}{6} =$
$\frac{11}{30} - \frac{9}{30} =$
$\frac{19}{22} - \frac{9}{22} =$
$\frac{2}{4} - \frac{1}{4} =$
$\frac{3}{7} - \frac{2}{7} =$
$\frac{3}{4} - \frac{1}{4} =$
$\frac{11}{13} - \frac{3}{13} =$
$\frac{4}{7} - \frac{2}{7} =$
$\frac{9}{10} - \frac{7}{10} =$
$\frac{5}{6} - \frac{1}{6} =$
$\frac{18}{19} - \frac{3}{19} =$
$\frac{5}{8} - \frac{1}{8} =$
$\frac{2}{3} - \frac{1}{3} =$
$\frac{23}{30} - \frac{7}{30} =$
$\frac{14}{15} - \frac{13}{15} =$
$\frac{3}{5} - \frac{1}{5} =$
答案
1.$\frac{4}{9}$ 2.$\frac{3}{5}$ 3.$\frac{6}{10}$ 4.$\frac{3}{9}$ 5.$\frac{3}{8}$ 6.$\frac{8}{29}$ 7.$\frac{5}{21}$ 8.$\frac{1}{10}$ 9.$\frac{1}{6}$ 10.$\frac{2}{30}$ 11.$\frac{10}{22}$ 12.$\frac{1}{4}$ 13.$\frac{1}{7}$ 14.$\frac{2}{4}$ 15.$\frac{8}{13}$ 16.$\frac{2}{7}$ 17.$\frac{2}{10}$ 18.$\frac{4}{6}$ 19.$\frac{15}{19}$ 20.$\frac{4}{8}$ 21.$\frac{1}{3}$ 22.$\frac{16}{30}$ 23.$\frac{1}{15}$ 24.$\frac{2}{5}$
二、在括号里填上合适的数。
$( )-\frac{1}{5}=\frac{3}{5}$
$\frac{6}{7}-( )=\frac{4}{7}$
$\frac{7}{8}-( )=0$
$( )-\frac{2}{10}=\frac{5}{10}$
$( )-\frac{2}{8}=\frac{5}{8}$
$\frac{7}{9}-( )=\frac{4}{9}$
$( )-\frac{1}{5}=\frac{3}{5}$
$\frac{6}{7}-( )=\frac{4}{7}$
$\frac{7}{8}-( )=0$
$( )-\frac{2}{10}=\frac{5}{10}$
$( )-\frac{2}{8}=\frac{5}{8}$
$\frac{7}{9}-( )=\frac{4}{9}$
答案
1.$\frac{4}{5}$ 2.$\frac{2}{7}$ 3.$\frac{7}{8}$ 4.$\frac{7}{10}$ 5.$\frac{7}{8}$ 6.$\frac{3}{9}$
三、将$\frac{1}{10}$、$\frac{2}{10}$、$\frac{3}{10}$、$\frac{4}{10}$、$\frac{5}{10}$、$\frac{6}{10}$、$\frac{7}{10}$、$\frac{8}{10}$填入下面的括号里，使等式成立。（每道算式中每个分数只能用一次）
(1)$(\quad)+(\quad)=(\quad)+(\quad)=(\quad)+(\quad)=(\quad)+(\quad)$
(2)$(\quad)-(\quad)=(\quad)-(\quad)=(\quad)-(\quad)=(\quad)-(\quad)$
1.
5.
(1)$(\quad)+(\quad)=(\quad)+(\quad)=(\quad)+(\quad)=(\quad)+(\quad)$
(2)$(\quad)-(\quad)=(\quad)-(\quad)=(\quad)-(\quad)=(\quad)-(\quad)$
1.
$\frac{1}{10}$
2.$\frac{8}{10}$
3.$\frac{2}{10}$
4.$\frac{7}{10}$
5.
$\frac{3}{10}$
6.$\frac{6}{10}$
7.$\frac{4}{10}$
8.$\frac{5}{10}$
答案
(1)$\frac{1}{10}+\frac{8}{10}=\frac{2}{10}+\frac{7}{10}=\frac{3}{10}+\frac{6}{10}=\frac{4}{10}+\frac{5}{10}$
(2)$\frac{2}{10}-\frac{1}{10}=\frac{4}{10}-\frac{3}{10}=\frac{6}{10}-\frac{5}{10}=\frac{8}{10}-\frac{7}{10}$（答案不唯一）
1.$\frac{1}{10}$ 2.$\frac{8}{10}$ 3.$\frac{2}{10}$ 4.$\frac{7}{10}$ 5.$\frac{3}{10}$ 6.$\frac{6}{10}$ 7.$\frac{4}{10}$ 8.$\frac{5}{10}$
(2)$\frac{2}{10}-\frac{1}{10}=\frac{4}{10}-\frac{3}{10}=\frac{6}{10}-\frac{5}{10}=\frac{8}{10}-\frac{7}{10}$（答案不唯一）
1.$\frac{1}{10}$ 2.$\frac{8}{10}$ 3.$\frac{2}{10}$ 4.$\frac{7}{10}$ 5.$\frac{3}{10}$ 6.$\frac{6}{10}$ 7.$\frac{4}{10}$ 8.$\frac{5}{10}$
