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第109頁

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?$ =\frac {6×3}{5×5}$?
?$ =\frac {18}{25}$?
?$ =\frac {2×5}3$?
?$ =\frac {10}3$?
?$ =\frac 54×\frac 85$?
?$ =2$?
?$ =9×\frac {13}6×\frac 4{39}$?
?$ =9×(\frac {13}6×\frac 4{39})$?
?$ =9×\frac 29$?
?$ =2$?
?$ =\frac 35×\frac 16×\frac {10}9$?
?$ =\frac 1{10}×\frac {10}9$?
?$ =\frac 19$?
?$ =\frac 78×\frac {25}{21}×\frac {16}5$?
?$ =\frac {25}{24}×\frac {16}5$?
?$ =\frac {10}3$?
?$ =(\frac 45+\frac {11}5)×\frac 7{12}$?
?$ =3×\frac 7{12}$?
?$ =\frac 74$?
?$ =(21+\frac 7{12})×\frac 37$?
?$ =21×\frac 37+\frac 7{12}×\frac 37$?
?$ =9+\frac 14$?
?$ =9\frac 14$?
?$ =\frac {32}{33}×(33+1)$?
?$ =\frac {32}{33}×33+\frac {32}{33}$?
?$ =32+\frac {32}{33}$?
?$ =32\frac {32}{33}$?
?$ =[1-\frac 7{20}]×\frac {25}{26}$?
?$ =\frac {13}{20}×\frac {25}{26}$?
?$ =\frac 58$?
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