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第67頁

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$1\frac{5}{12}$
$\frac{3}{11}$
0.36
$\frac{4}{5}$
$\frac{1}{6}$
$\frac{2}{3}$
0.3
$\frac{1}{2}$
?$=\frac {3}{8}+\frac {5}{6}$?
?$=\frac {29}{24}$?
?$=(\frac {4}{7}+\frac {3}{7})+(\frac {3}{11}-\frac {3}{11})$?
?$=1+0$?
?$=1$?
?$=2-(1-\frac {1}{32})$?
?$=2- \frac {31}{32}$?
?$=1 \frac {1}{32}$?
?$=(\frac {8}{7}+\frac {4}{7})-(\frac {2}{5}+\frac {3}{5})$?
?$=\frac {12}{7}-1$?
?$=\frac {5}{7}$?
?$=\frac {4}{5}-\frac {1}{5}$?
?$=\frac {3}{5}$?
?$=\frac {2}{7}+[\frac {4}{5}-\frac {1}{2}]$?
?$=\frac {2}{7}+\frac {3}{10}$?
?$=\frac {41}{70}$?
$\begin{aligned}解：4.2+5x&=8.2\\5x&=4\\x&=0.8\end{aligned}$
$\begin{aligned}解：0.5x&=\frac {3}{2}+\frac {1}{2}\\0.5x&=2\\x&=4\end{aligned}$
$\begin{aligned}解：0.4x&=10\\x&=25\end{aligned}$
$\begin{aligned}解：x-1&=\frac {5}{9}\\x&=\frac {14}{9}\end{aligned}$
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