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第33页

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6.18

$\frac {11}{12}$

$\frac {36}{25}$

$\frac {5}{6}$

$\frac {9}{16}$

$=\frac {1}{4}×(3.64+4.36)$

$=\frac {1}{4}×8$

$=2$

$=\frac {2}{5}÷(\frac {1}{2}+\frac {3}{10})$

$=\frac {2}{5}÷\frac {4}{5}$

$=\frac {1}{2}$

=6+10

=16

$\begin{aligned}解：\frac {1}{5}x&=\frac {2}{3}×\frac {3}{4}\\\frac {1}{5}x&=\frac {1}{2}\\x&=\frac {5}{2}\end{aligned}$

$\begin{aligned}解：\frac {2}{3}x&=5×\frac {4}{5}\\\frac {2}{3}x&=4\\x&=6\end{aligned}$

$\begin{aligned}解：\frac {3}{5}x&=42×\frac {5}{7}\\\frac {3}{5}x&=30\\x&=50\end{aligned}$