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第13頁

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72
53
?$\frac {5}{3}$?
17.6
0.9
2
3
?$1\frac {1}{4}$?
?$ \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}$?
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