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第63页

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$\frac {5}{8}=\frac {15}{24}$

$\frac {5}{6}=\frac {20}{24}$

$\frac {2}{3}=\frac {10}{15}$

$\frac {1}{5}=\frac {3}{15}$

$ \frac {1}{4}=\frac {3}{12}$

$\frac {5}{12}=\frac {5}{12}$

$\frac {11}{12}=\frac {66}{72}，$$\frac {3}{8}=\frac {27}{72}，$$\frac {5}{9}=\frac {40}{72}$

$\frac {2}{3}=\frac {40}{60}，\frac {3}{4}=\frac {45}{60}，\frac {1}{5}=\frac {12}{60}$

$\frac 12$

$\frac 17$

$\frac {5b}{ab}$

$\frac {2a}{ab}$

20÷5=4

a=45÷(4+1)=9

b=4×9=36