第62页

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$7\frac{1}{5}$
$\frac{2}{49}$
25
$\frac{9}{16}$
$\frac{2}{3}$
$\frac{5}{6}$
$12\frac{4}{5}$
$5\frac{1}{3}$
​$ =\frac {3}{10}×9×30$​
​$ =\frac {27}{10}×30$​
​$ =81$​
​$ =\frac {51}{44}×\frac {22}{51}$​
​$ =\frac {1}{2}$​
​$ =\frac {2}{3}×\frac {1}{5}×\frac {15}{4}$​
​$ =\frac {2}{15}×\frac {15}{4}$​
​$ =\frac {1}{2}$​
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