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第49页

信息发布者：

$\frac {1}{12}$

$1\frac {5}{8}$

$\frac {9}{8}$

$ =\frac {5}{9}×17+\frac {4}{9}×17$

$ =17×(\frac {5}{9}+\frac {4}{9})$

$ =17×1$

$ =17$

部分

总体

5070

5.6

7080

205

5.2

$\begin{aligned}解：8x&=200\\x&=200÷8\\x&=25\end{aligned}$

$\begin{aligned}解：1.7x&=340\\x&=340÷1.7\\x&=200\end{aligned}$

$\begin{aligned}解：\frac {7}{2}x&=14\\x&=14×\frac {2}{7}\\x&=4\end{aligned}$

$ =(\frac {2}{3}+\frac {1}{9})×\frac {3}{7}$

$ =\frac {7}{9}×\frac {3}{7}$

$ =\frac {1}{3}$

$=6.7×\frac {1}{4}+3.3×\frac {1}{4}$

$=\frac {1}{4}×(6.7+3.3)$

$=\frac {1}{4}×10$

$=2.5$

$=\frac {4}{9}+\frac {2}{3}×\frac {1}{3}$

$=\frac {4}{9}+\frac {2}{9}$

$=\frac {2}{3}$