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電子課本網(wǎng) › 第51頁

第51頁

信息發(fā)布者：

=45-25

=20

?$=\frac {3}{8}×(\frac {2}{7}+\frac {5}{7})$?

?$=\frac {3}{8}×1$?

?$=\frac {3}{8}$?

?$=\frac {5}{7}÷\frac {5}{72}$?

?$=\frac {72}{7}$?

?$=1-\frac {1}{4}-\frac {3}{4}$?

?$=1-1$?

?$=0$?

?$=\frac {5}{6}×(\frac {23}{30}+\frac {7}{30})$?

?$=\frac {5}{6}×1$?

?$=\frac {5}{6}$?

?$=(\frac {2}{3}-\frac {1}{4})×\frac {9}{8}$?

?$=\frac {5}{12}×\frac {9}{8}$?

?$=\frac {15}{32}$?

?$\frac {7}{9}-\frac {1}{9}=\frac {2}{3}($?千米?$)$?

答：還剩?$\frac {2}{3}$?千米沒有修。

?$\frac {7}{9}×\frac {1}{9}=\frac {7}{81}($?千米?$)$?

答：還剩下?$\frac {7}{81}$?千米沒有修。