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第84页

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0.5

0.027

$\frac {18}{5}$

$\frac {2}{3}$

$\frac {27}{8}$

=150-96

=54

=(10.5+7.5)-(6.25+3.75)

=18-10

$=\frac {3}{8}×30+2×\frac {3}{8}$

$=\frac {3}{8}×(30+2)$

$=\frac {3}{8}×32$

$=12$

$=56×\frac {11}{7}×\frac {11}{8}$

$=121$

$=\frac {5}{8}÷(\frac {13}{12}-\frac {1}{12}-\frac {1}{4})$

$=\frac {5}{8}÷\frac {3}{4}$

$=\frac {5}{6}$

=3+6-4

$\begin {aligned}解：\frac {2}{3}x&=\frac {5}{9}×36\\\frac {2}{3}x&=20\\x &=30\end {aligned}$

$\begin {aligned}解：5x&=37.9-12.9\\5x&=25\\x &=5\end {aligned}$

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