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第121页

信息发布者：

$\frac{1}{6}$

$\frac{3}{5}$

$\frac{1}{3}$

$\frac{1}{2}$

$1\frac{5}{12}$

$1\frac{1}{5}$

$\frac{3}{4}$

28.26

$=\frac {4}{5}-\frac {1}{5}$

$=\frac {3}{5}$

$=\frac {5}{12}+\frac {19}{12}+\frac {5}{8}$

$=2+\frac {5}{8}$

$=2 \frac {5}{8}$

$=\frac {9}{14}+\frac {1}{2}$

$=\frac {8}{7}$

$=(\frac {11}{12}+\frac {1}{12})+(\frac {5}{8}+\frac {3}{8})$

$=1+1$

$=2$

$\begin{aligned}解：x+\frac {1}{7}&=1\\x&=\frac {6}{7}\end{aligned}$

$\begin{aligned} 解：0.2x&=13.6\\x&=68\end{aligned}$

$\begin{aligned}解：2.5x&=18\\x&=7.2\end{aligned}$

$\begin{aligned} 解：6x+33&=51\\6x&=18\\x&=3\end{aligned}$