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第49頁(yè)

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?$\frac {1}{12}$?
20
75
1
5
4
?$1\frac {5}{8}$?
2
?$\frac {9}{8}$?
52
?$ =\frac {5}{9}×17+\frac {4}{9}×17$?
?$ =17×(\frac {5}{9}+\frac {4}{9})$?
?$ =17×1$?
?$ =17$?
部分
總體
5070
5.6
7080
205
5.2
25
?$\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$?

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