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第13页

信息发布者：

$\frac {5}{3}$

17.6

0.9

$1\frac {1}{4}$

$ \frac {3}{4}千米=750米$

$ 750米：500米=3：2$

$\frac {1}{0.25}=4：1 $

$ 12.6：0.4=63：2$

$\begin{aligned}解：\frac {1}{9}x&=2－\frac {8}{9}\\\frac {1}{9}x&=\frac {10}{9}\\x&=\frac {10}{9}×9\\x&=10\end{aligned}$

$\begin{aligned}解：\frac {1}{4}x&=\frac {1}{6}\\x&=\frac {1}{6}×4\\x&=\frac {2}{3}\end{aligned}$

$\begin{aligned}解：0.5x&=3.2\\x&=3.2÷0.5\\x&=6.4\end{aligned}$

$=1－(\frac {1}{6}+\frac {2}{12})$

$=1－(\frac {1}{6}+\frac {1}{6})$

$=1－\frac {1}{3}$

$=\frac {2}{3}$

$=4－2+3$

$=5$

$=\frac {7}{4}×\frac {5}{8}+\frac {1}{4}×\frac {5}{8}$

$=\frac {5}{8}×(\frac {7}{4}+\frac {1}{4})$

$=\frac {5}{8}×2$

$=\frac {5}{4}$