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第55頁

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$\frac{2}{3}$
$1\frac{3}{10}$
$1\frac{1}{2}$
$\frac{2}{15}$
$\frac{5}{7}$
$1\frac{11}{20}$
$\frac{1}{3}$
1
?$=\frac {20}{30}+\frac {24}{30}-\frac {9}{30}$?
?$=\frac {22}{15}-\frac {9}{30}$?
?$=\frac {7}{6}$?
?$=\frac {7}{10}+\frac {3}{10}-\frac {3}{7}$?
?$=1-\frac {3}{7}$?
?$= \frac {4}{7}$?
?$=(\frac {7}{6}+\frac {5}{6})-(\frac {3}{10}+\frac {3}{10})$?
?$=2-\frac {3}{5}$?
?$=1 \frac {2}{5}$?
?$=(\frac {7}{8}+\frac {1}{8})+(\frac {2}{5}+\frac {3}{5})$?
?$=1+1$?
?$=2$?
?$=(\frac {11}{8}-\frac {3}{8})-(\frac {5}{6}+\frac {1}{6})$?
?$=1-1$?
?$=0$?
?$=1-\frac {1}{32}$?
?$= \frac {31}{32}$?
$\begin{aligned}解：4.7x&=23.5\\x&=5\end{aligned}$
$\begin{aligned}解：5x&=1\\x&=0.2\end{aligned}$
$\begin{aligned}解：8x-8&=50\\8x&=58\\x&=7.25\end{aligned}$
$\begin{aligned}解：8x&=20.4×2×1.2\\8x&=40.8×1.2\\8x&=48.96\\x&=6.12\end{aligned}$
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