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第70頁(yè)

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$1\frac{1}{2}$
$\frac{2}{7}$
20
$\frac{1}{2}$
$\frac{3}{8}$
$\frac{1}{6}$
$7\frac{1}{2}$
0
?$10 ×\frac {4}{5} ×\frac {5}{8}=5($?噸?$)$?
?$36 ×\frac {2}{3} ×\frac {3}{4}=18( $?個(gè)?$)$?
?$=(\frac {7}{13}-\frac {2}{13}) ×\frac {2}{5}$?
?$=\frac {5}{13} ×\frac {2}{5}$?
?$=\frac {2}{13}$?
?$=24 ×(1-\frac {18}{19})$?
?$=24 ×\frac {1}{19}$?
?$=\frac {24}{19}$?
?$=\frac {5}{7} ×4+\frac {5}{7} ×\frac {4}{3}$?
?$=\frac {5}{7} ×(4+\frac {4}{3})$?
?$=\frac {5}{7} ×\frac {16}{3}$?
?$=\frac {80}{21}$?
$\begin {aligned}解：\frac {5}{6}x&=\frac {1}{4}\\x &=\frac {3}{10}\end {aligned}$
$\begin {aligned}解：\frac {2}{9}x&=\frac {2}{15}\\x &=\frac {3}{5}\end {aligned}$
$\begin {aligned}解：\frac {3}{5}x&=50-20\\\frac {3}{5}x&=30\\x &=50\end {aligned}$
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