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第78頁

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B
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B
?$ \frac {3}{2}$?
8
?$ \frac {3}{7}$?
0
?$ \frac {5}{4}$?
?$ \frac {1}{5}$?
?$ \frac {2}{3}$?
?$ \frac {10}{3}$?
?$=\frac {3}{8} ×\frac {3}{2}$?
?$=\frac {9}{16}$?
?$=(6-\frac {28}{5}) ×\frac {2}{5}$?
?$=\frac {2}{5 } ×\frac {2}{5}$?
?$=\frac {4}{25}$?
?$=\frac {1}{7} ×(\frac {6}{13}+\frac {8}{13})$?
?$=\frac {1}{7} ×\frac {14}{13}$?
?$=\frac {2}{13}$?
?$=(\frac {3}{4}-\frac {3}{4}) ×8$?
?$=0 ×8$?
?$=0$?
?$=\frac {7}{16} ×45-\frac {7}{16} ×45$?
?$=(\frac {7}{16}-\frac {7}{16}) ×45$?
?$=0$?
?$=\frac {3}{5} \div (\frac {1}{12} ×\frac {5}{6})$?
?$=\frac {3}{5} ×\frac {72}{5}$?
?$=\frac {216}{25}$?
解：?$\frac {7}{5}x=21$?
?$x=15$?
解：?$\frac {5}{7}x=\frac {1}{14}$?
?$x=\frac {1}{10}$?
解：?$\frac {7}{12}x=84$?
?$x=144$?
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