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電子課本網(wǎng) › 第48頁(yè)

第48頁(yè)

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?$\frac {2}{3}=\frac {6}{9}，$??$\frac {5}{9}=\frac {5}{9}$?
?$\frac {2}{7}=\frac {16}{56}，$??$\frac {3}{8}=\frac {21}{56}$?
?$\frac {7}{9}=\frac {28}{36}，$??$\frac {11}{12}=\frac {33}{36}$?
?$\frac {7}{12}=\frac {14}{24}，$??$\frac {7}{8}=\frac {21}{24}$?
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?$\frac 78=\frac {63}{72}，$??$\frac 79=\frac {56}{72}$?
?$\frac {62}{72}，$??$\frac {61}{72}，$??$\frac {60}{72}，$??$\frac {59}{72}，$??$\frac {58}{72}，$??$\frac {57}{72}$?
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