电子课本网 第62页

第62页

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

$=\frac {51}{44}×\frac {22}{51}$
$=\frac {1}{2}$

$=\frac {2}{3}×\frac {1}{5}×\frac {15}{4}$
$=\frac {2}{15}×\frac {15}{4}$
$=\frac {1}{2}$