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第57頁

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??$\frac {8}{15}$??
8.1
32
35
??$\frac {2}{3}$??
0.6
1500
24.7
0.04
1
??$\begin{aligned}解：0.6x&=18.6\\x&=18.6÷0.6\\x&=31\end{aligned}$??
??$\begin{aligned}解：\frac {1}{8}x&=\frac {1}{40}\\x&=\frac {1}{40}×8\\x&=\frac {1}{5}\end{aligned}$??
??$\begin{aligned}解：\frac {3}{2}x－\frac {1}{4}x&=\frac {3}{4}\\\frac {5}{4}x&=\frac {3}{4}\\x&=\frac {3}{4}×\frac {4}{5}\\x&=\frac {3}{5}\end{aligned}$??
??$=(\frac {3}{7}+\frac {4}{7})－(\frac {2}{5}+\frac {3}{5})$??
??$=1－1$??
??$=0$??
??$ =\frac {1}{4}×\frac {3}{7}+\frac {4}{7}×\frac {1}{4}$??
??$ =\frac {1}{4}×(\frac {3}{7}+\frac {4}{7})$??
??$ =\frac {1}{4}×1$??
??$ =\frac {1}{4}$??
??$ =(4×2.5)×(0.8×12.5)$??
??$ =10×10$??
??$ =100$??
??$=(2.9+1.1)÷\frac {4}{5}$??
??$=4×\frac {5}{4}$??
??$=5$??
??$=(49+1)×\frac {48}{49}$??
??$=48+\frac {48}{49}$??
??$=48\frac {48}{49}$??
??$=6×3－\frac {1}{3}×\frac {1}{6}$??
??$=18－\frac {1}{18}$??
??$=17\frac {17}{18}$??
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