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第84頁(yè)

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C
24
10
0.5
0.027
?$\frac {18}{5}$?
?$\frac {2}{3}$?
20
?$\frac {27}{8}$?
=150-96
=54
=(10.5+7.5)-(6.25+3.75)
=18-10
=8
?$=\frac {3}{8}×30+2×\frac {3}{8}$?
?$=\frac {3}{8}×(30+2)$?
?$=\frac {3}{8}×32$?
?$=12$?
?$=56×\frac {11}{7}×\frac {11}{8}$?
?$=121$?
?$=\frac {5}{8}÷(\frac {13}{12}-\frac {1}{12}-\frac {1}{4})$?
?$=\frac {5}{8}÷\frac {3}{4}$?
?$=\frac {5}{6}$?
=3+6-4
=5
$\begin {aligned}解：\frac {2}{3}x&=\frac {5}{9}×36\\\frac {2}{3}x&=20\\x &=30\end {aligned}$
$\begin {aligned}解：5x&=37.9-12.9\\5x&=25\\x &=5\end {aligned}$
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