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第121頁

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B
A
A
D
B
B
B
$\frac{1}{6}$
$\frac{3}{5}$
$\frac{1}{3}$
$\frac{1}{2}$
$1\frac{5}{12}$
$1\frac{1}{5}$
$\frac{3}{4}$
28.26
?$=\frac {4}{5}-\frac {1}{5}$?
?$=\frac {3}{5}$?
?$=\frac {5}{12}+\frac {19}{12}+\frac {5}{8}$?
?$=2+\frac {5}{8}$?
?$=2 \frac {5}{8}$?
?$=\frac {9}{14}+\frac {1}{2}$?
?$=\frac {8}{7}$?
?$=(\frac {11}{12}+\frac {1}{12})+(\frac {5}{8}+\frac {3}{8})$?
?$=1+1$?
?$=2$?
$\begin{aligned}解：x+\frac {1}{7}&=1\\x&=\frac {6}{7}\end{aligned}$
?$\begin{aligned} 解：0.2x&=13.6\\x&=68\end{aligned}$?
?$\begin{aligned}解：2.5x&=18\\x&=7.2\end{aligned}$?
?$\begin{aligned} 解：6x+33&=51\\6x&=18\\x&=3\end{aligned}$?
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