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第61頁(yè)

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$\frac{5}{8}$
$\frac{2}{9}$
$\frac{1}{9}$
$1\frac{1}{7}$
$\frac{3}{5}$
$3\frac{1}{4}$
0.7
$2\frac{3}{4}$
?$=\frac {3}{4}-\frac {17}{24}$?
?$=\frac {1}{24}$?
?$=(\frac {4}{7}-\frac {3}{7})+(\frac {7}{8}+\frac {1}{8})$?
?$=\frac {1}{7}+1$?
?$=\frac {8}{7}$?
?$=\frac {3}{5}+\frac {7}{5}+\frac {7}{6}$?
?$=2+\frac {7}{6}$?
?$=\frac {19}{6}$?
?$=\frac {11}{10}-(\frac {2}{5}+\frac {3}{5})$?
?$=\frac {11}{10}-1$?
?$=\frac {1}{10}$?
?$=3-(\frac {6}{11}+\frac {7}{11}+\frac {9}{11})$?
?$=3-2$?
?$=1$?
?$=1-\frac {1}{16}$?
?$= \frac {15}{16}$?
$\begin{aligned}解：7x&=0.56\\x&=0.08\end{aligned}$
$\begin{aligned}解：5x+1&=65\\5x&=64\\x&=12.8\end{aligned}$
$\begin{aligned}解：3x+8.5&=10\\3x&=1.5\\x&=0.5\end{aligned}$
$\begin{aligned}解：0.4x&=1\\x&=2.5\end{aligned}$
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