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1. 直接写出得数。
$\frac{2}{7} - \frac{1}{7} =$$ $$\frac{6}{8} + \frac{1}{8} =$$ $$\frac{(\ \ \ \ \ \ )}{(\ \ \ \ \ \ )} + \frac{4}{7} = 1$$ $$\frac{3}{8} + \frac{3}{8} - \frac{4}{8} =$
$\frac{4}{9} + \frac{4}{9} =$$ $$\frac{9}{9} - \frac{5}{9} =$$ $$\frac{(\ \ \ \ \ \ )}{(\ \ \ \ \ \ )} - \frac{1}{8} = \frac{6}{8}$$ $$\frac{2}{10} + \frac{3}{10} + \frac{4}{10} =$
$\frac{8}{10} - \frac{5}{10} =$$ $$\frac{2}{7} + \frac{5}{7} =$$ $$\frac{2}{9} + \frac{(\ \ \ \ \ \ )}{(\ \ \ \ \ \ )} = \frac{8}{9}$$ $$\frac{6}{7} - \frac{1}{7} - \frac{1}{7} =$
$\frac{3}{9} + \frac{3}{9} =$$ $$\frac{9}{10} - \frac{3}{10} =$$ $$\frac{3}{11} - \frac{(\ \ \ \ \ \ )}{(\ \ \ \ \ \ )} = \frac{1}{11}$$ $$\frac{5}{9} + \frac{2}{9} - \frac{4}{9} =$
$\frac{5}{5} - \frac{2}{5} =$$ $$\frac{6}{8} - \frac{1}{8} =$$ $$\frac{(\ \ \ \ \ \ )}{(\ \ \ \ \ \ )} + \frac{7}{10} = 1$$ $$\frac{8}{11} - \frac{5}{11} + \frac{4}{11} =$
$\frac{2}{7} - \frac{1}{7} =$$ $$\frac{6}{8} + \frac{1}{8} =$$ $$\frac{(\ \ \ \ \ \ )}{(\ \ \ \ \ \ )} + \frac{4}{7} = 1$$ $$\frac{3}{8} + \frac{3}{8} - \frac{4}{8} =$
$\frac{4}{9} + \frac{4}{9} =$$ $$\frac{9}{9} - \frac{5}{9} =$$ $$\frac{(\ \ \ \ \ \ )}{(\ \ \ \ \ \ )} - \frac{1}{8} = \frac{6}{8}$$ $$\frac{2}{10} + \frac{3}{10} + \frac{4}{10} =$
$\frac{8}{10} - \frac{5}{10} =$$ $$\frac{2}{7} + \frac{5}{7} =$$ $$\frac{2}{9} + \frac{(\ \ \ \ \ \ )}{(\ \ \ \ \ \ )} = \frac{8}{9}$$ $$\frac{6}{7} - \frac{1}{7} - \frac{1}{7} =$
$\frac{3}{9} + \frac{3}{9} =$$ $$\frac{9}{10} - \frac{3}{10} =$$ $$\frac{3}{11} - \frac{(\ \ \ \ \ \ )}{(\ \ \ \ \ \ )} = \frac{1}{11}$$ $$\frac{5}{9} + \frac{2}{9} - \frac{4}{9} =$
$\frac{5}{5} - \frac{2}{5} =$$ $$\frac{6}{8} - \frac{1}{8} =$$ $$\frac{(\ \ \ \ \ \ )}{(\ \ \ \ \ \ )} + \frac{7}{10} = 1$$ $$\frac{8}{11} - \frac{5}{11} + \frac{4}{11} =$
答案
1. $\frac{1}{7}$ $\frac{7}{8}$ $\frac{3}{7}$ $\frac{2}{8}$
$\frac{8}{9}$ $\frac{4}{9}$ $\frac{7}{8}$ $\frac{9}{10}$
$\frac{3}{10}$ $\frac{7}{7}$（或1）$\frac{6}{9}$ $\frac{4}{7}$
$\frac{6}{9}$ $\frac{6}{10}$ $\frac{2}{11}$ $\frac{3}{9}$
$\frac{3}{5}$ $\frac{5}{8}$ $\frac{3}{10}$ $\frac{7}{11}$
$\frac{8}{9}$ $\frac{4}{9}$ $\frac{7}{8}$ $\frac{9}{10}$
$\frac{3}{10}$ $\frac{7}{7}$（或1）$\frac{6}{9}$ $\frac{4}{7}$
$\frac{6}{9}$ $\frac{6}{10}$ $\frac{2}{11}$ $\frac{3}{9}$
$\frac{3}{5}$ $\frac{5}{8}$ $\frac{3}{10}$ $\frac{7}{11}$
2. 在$〇$里填“$＞$”“$＜$”或“$=$”。
$\frac{4}{5} - \frac{3}{5}〇\frac{1}{5} + \frac{1}{5}$$ $$\frac{6}{7} - \frac{3}{7}〇\frac{2}{7} + \frac{2}{7}$$ $$\frac{1}{4} + \frac{3}{4}〇\frac{2}{3} + \frac{1}{3}$
$\frac{3}{10} + \frac{6}{10}〇\frac{9}{10} - \frac{2}{10}$$ $$\frac{2}{6} + \frac{2}{6}〇1 - \frac{2}{6}$$ $$\frac{5}{9} - \frac{2}{9}〇\frac{2}{9} + \frac{5}{9}$
$\frac{4}{5} - \frac{3}{5}〇\frac{1}{5} + \frac{1}{5}$$ $$\frac{6}{7} - \frac{3}{7}〇\frac{2}{7} + \frac{2}{7}$$ $$\frac{1}{4} + \frac{3}{4}〇\frac{2}{3} + \frac{1}{3}$
$\frac{3}{10} + \frac{6}{10}〇\frac{9}{10} - \frac{2}{10}$$ $$\frac{2}{6} + \frac{2}{6}〇1 - \frac{2}{6}$$ $$\frac{5}{9} - \frac{2}{9}〇\frac{2}{9} + \frac{5}{9}$
答案
2. $＜$ $＜$ $=$
$＞$ $=$ $＜$
$＞$ $=$ $＜$
3. 看图写算式。
(1)
$\frac{1}{2} + \frac{1}{(\ \ \ \ \ \ )} + \frac{1}{(\ \ \ \ \ \ )} = 1$
(2)
$\frac{1}{4} + \frac{1}{(\ \ \ \ \ \ )} + \frac{1}{(\ \ \ \ \ \ )} + \frac{1}{(\ \ \ \ \ \ )} = 1$
(3)
（4）
(1)
$\frac{1}{2} + \frac{1}{(\ \ \ \ \ \ )} + \frac{1}{(\ \ \ \ \ \ )} = 1$
(2)
$\frac{1}{4} + \frac{1}{(\ \ \ \ \ \ )} + \frac{1}{(\ \ \ \ \ \ )} + \frac{1}{(\ \ \ \ \ \ )} = 1$
(3)
（4）
答案
3. （1）$\frac{1}{2}+\frac{1}{4}+\frac{1}{4}=1$
（2）$\frac{1}{4}+\frac{1}{4}+\frac{1}{4}+\frac{1}{4}=1$
（3）$\frac{5}{9}+\frac{4}{9}=1$
（4）$\frac{5}{6}-\frac{2}{6}=\frac{3}{6}$
（2）$\frac{1}{4}+\frac{1}{4}+\frac{1}{4}+\frac{1}{4}=1$
（3）$\frac{5}{9}+\frac{4}{9}=1$
（4）$\frac{5}{6}-\frac{2}{6}=\frac{3}{6}$
