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第39页

信息发布者：

$1$

$4\frac{1}{4}$

$\frac{1}{6}$

$6$

$\frac{3}{5}$

$0$

$\frac{1}{10}$

$0.25$

$26$

$3$

$11$

$5$

$ \begin {aligned}&=\frac {7}{8}-\frac {7}{8}+\frac {8}{9}\\&=0+\frac {8}{9}\\&=\frac {8}{9}\end {aligned}$

$ \begin {aligned}&=\frac {6}{5}×\frac {2}{5}\\&=\frac {12}{25}\end {aligned}$

$ \begin {aligned}&=(\frac {3}{7}+\frac {11}{7})-(\frac {4}{13}+\frac {8}{13})\\&=2-\frac {12}{13}\\&=1\frac {1}{13}\end {aligned}$

$ \begin {aligned}&=(4.37+5.73)+(\frac {29}{24}-\frac {5}{24})\\&=10.1+1\\&=11.1\end {aligned}$

解：

$\begin{aligned}x-\frac{4}{7}&=\frac{1}{3}\\x&=\frac{1}{3}+\frac{4}{7}\\x&=\frac{19}{21}\end{aligned}$

解：

$\begin{aligned}17x+18x&=420\\35x&=420\\x&=12\end{aligned}$

 解：

 $\begin{aligned}1.6x÷0.5&=25.6\\1.6x&=12.8\\x&=8\end{aligned}$

$3$

$20$

$30$

$12$千米/时