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第55页

信息发布者：

$\frac{2}{3}$

$1\frac{3}{10}$

$1\frac{1}{2}$

$\frac{2}{15}$

$\frac{5}{7}$

$1\frac{11}{20}$

$\frac{1}{3}$

$=\frac {20}{30}+\frac {24}{30}-\frac {9}{30}$

$=\frac {22}{15}-\frac {9}{30}$

$=\frac {7}{6}$

$=\frac {7}{10}+\frac {3}{10}-\frac {3}{7}$

$=1-\frac {3}{7}$

$= \frac {4}{7}$

$=(\frac {7}{6}+\frac {5}{6})-(\frac {3}{10}+\frac {3}{10})$

$=2-\frac {3}{5}$

$=1 \frac {2}{5}$

$=(\frac {7}{8}+\frac {1}{8})+(\frac {2}{5}+\frac {3}{5})$

$=1+1$

$=2$

$=(\frac {11}{8}-\frac {3}{8})-(\frac {5}{6}+\frac {1}{6})$

$=1-1$

$=0$

$=1-\frac {1}{32}$

$= \frac {31}{32}$

$\begin{aligned}解：4.7x&=23.5\\x&=5\end{aligned}$

$\begin{aligned}解：5x&=1\\x&=0.2\end{aligned}$

$\begin{aligned}解：8x-8&=50\\8x&=58\\x&=7.25\end{aligned}$

$\begin{aligned}解：8x&=20.4×2×1.2\\8x&=40.8×1.2\\8x&=48.96\\x&=6.12\end{aligned}$