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第29頁

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$\frac{2}{9}$
$\frac{2}{7}$
$\frac{4}{5}$
$\frac{1}{2}$
$3\frac{3}{4}$
1
8
$\frac{3}{5}$
?$ =\frac {8}{21}×7×\frac {9}{4}$?
?$ =\frac {8}{3}×\frac {9}{4}$?
?$ =6$?
?$ =\frac {11}{18}×\frac {2}{33}×\frac {9}{10}$?
?$ =\frac {1}{27}×\frac {9}{10}$?
?$ =\frac {1}{30}$?
?$ =\frac {14}{45}×18×\frac {10}{21}$?
?$ =\frac {28}{5}×\frac {10}{21}$?
?$ =\frac {8}{3}$?
?$ =\frac {21}{30}×6×\frac {5}{14}$?
?$ =\frac {21}{5}×\frac {5}{14}$?
?$ =\frac {3}{2}$?
80
40
10
625
75
7000
?$ \frac {3}{10}×5=\frac {3}{2}($?升?$)$?
?$ \frac {3}{2}$?升?$ <\frac {9}{5}$?升
答：?$5$?天不能喝完這瓶果汁?。?
?$ \frac {1}{8}×6×10=7\frac {1}{2}($?升?$)$?
答：?$10$?瓶這樣的牛奶一共有?$7\frac {1}{2}$?升。
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