1. 看图列式计算。
(1)
$1 - \frac{4}{7} = (\quad) - (\quad) = (\quad)$
(2)
$(\quad) - (\quad) = (\quad) - (\quad) = (\quad)$
(1)
$1 - \frac{4}{7} = (\quad) - (\quad) = (\quad)$
(2)
$(\quad) - (\quad) = (\quad) - (\quad) = (\quad)$
答案
1. (1)$1-\frac{4}{7}=\frac{7}{7}-\frac{4}{7}=\frac{3}{7}$
(2)$1-\frac{3}{8}=\frac{8}{8}-\frac{3}{8}=\frac{5}{8}$
(2)$1-\frac{3}{8}=\frac{8}{8}-\frac{3}{8}=\frac{5}{8}$
2. 算一算。
$\frac{6}{9} - \frac{4}{9} =$
$\frac{4}{6} + \frac{2}{6} =$
$\frac{3}{7} - \frac{1}{7} =$
$1 - \frac{3}{10} =$
$1 - \frac{1}{4} =$
$\frac{1}{5} + \frac{4}{5} =$
$1 - \frac{1}{3} =$
$1 - \frac{6}{9} =$
$\frac{6}{9} - \frac{4}{9} =$
$\frac{4}{6} + \frac{2}{6} =$
$\frac{3}{7} - \frac{1}{7} =$
$1 - \frac{3}{10} =$
$1 - \frac{1}{4} =$
$\frac{1}{5} + \frac{4}{5} =$
$1 - \frac{1}{3} =$
$1 - \frac{6}{9} =$
答案
$\frac{6}{9} - \frac{4}{9} =\frac{2}{9}$
$\frac{4}{6} + \frac{2}{6} =1$
$\frac{3}{7} - \frac{1}{7} =\frac{2}{7}$
$1 - \frac{3}{10} =\frac{7}{10}$
$1 - \frac{1}{4} =\frac{3}{4}$
$\frac{1}{5} + \frac{4}{5} =1$
$1 - \frac{1}{3} =\frac{2}{3}$
$1 - \frac{6}{9} =\frac{3}{9}$
$\frac{4}{6} + \frac{2}{6} =1$
$\frac{3}{7} - \frac{1}{7} =\frac{2}{7}$
$1 - \frac{3}{10} =\frac{7}{10}$
$1 - \frac{1}{4} =\frac{3}{4}$
$\frac{1}{5} + \frac{4}{5} =1$
$1 - \frac{1}{3} =\frac{2}{3}$
$1 - \frac{6}{9} =\frac{3}{9}$
3. 在○里填上“>”“<”或“=”。
$\frac{3}{6}+\frac{2}{6} ◯ 1-\frac{3}{6}$
$\frac{7}{8}-\frac{3}{8} ◯ \frac{3}{8}+\frac{2}{8}$
$1-\frac{7}{9} ◯ 1-\frac{4}{9}$
$\frac{6}{7}-\frac{2}{7} ◯ 1-\frac{3}{7}$
$\frac{2}{10}+\frac{6}{10} ◯ 1-\frac{3}{10}$
$\frac{2}{5}+\frac{1}{5} ◯ 1-\frac{1}{5}$
$\frac{3}{6}+\frac{2}{6} ◯ 1-\frac{3}{6}$
$\frac{7}{8}-\frac{3}{8} ◯ \frac{3}{8}+\frac{2}{8}$
$1-\frac{7}{9} ◯ 1-\frac{4}{9}$
$\frac{6}{7}-\frac{2}{7} ◯ 1-\frac{3}{7}$
$\frac{2}{10}+\frac{6}{10} ◯ 1-\frac{3}{10}$
$\frac{2}{5}+\frac{1}{5} ◯ 1-\frac{1}{5}$
答案
$\frac{3}{6}+\frac{2}{6} > 1-\frac{3}{6}$
$\frac{7}{8}-\frac{3}{8} < \frac{3}{8}+\frac{2}{8}$
$1-\frac{7}{9} < 1-\frac{4}{9}$
$\frac{6}{7}-\frac{2}{7} = 1-\frac{3}{7}$
$\frac{2}{10}+\frac{6}{10} > 1-\frac{3}{10}$
$\frac{2}{5}+\frac{1}{5} < 1-\frac{1}{5}$
$\frac{7}{8}-\frac{3}{8} < \frac{3}{8}+\frac{2}{8}$
$1-\frac{7}{9} < 1-\frac{4}{9}$
$\frac{6}{7}-\frac{2}{7} = 1-\frac{3}{7}$
$\frac{2}{10}+\frac{6}{10} > 1-\frac{3}{10}$
$\frac{2}{5}+\frac{1}{5} < 1-\frac{1}{5}$
4. 明明看一本书,看了一星期后还剩下这本书的$\frac{3}{4}$。明明看了这本书的几分之几?
答案
$1-\frac{3}{4}=\frac{1}{4}$
把一张长方形彩纸对折3次后沿折痕剪开,做窗花用去其中的3份,做折纸用去其中的2份。这张彩纸还剩几分之几?
答案
$2×2×2=8$(份)
$\frac{3}{8}+\frac{2}{8}=\frac{5}{8}$
$1-\frac{5}{8}=\frac{3}{8}$
$\frac{3}{8}+\frac{2}{8}=\frac{5}{8}$
$1-\frac{5}{8}=\frac{3}{8}$
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