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第55頁

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$\frac{5}{8}$

$\frac{2}{9}$

$\frac{1}{9}$

$\frac{8}{7}$

$\frac{3}{5}$

$3\frac{1}{4}$

$\frac{7}{10}$

$2 {\frac{3} {4}}$

$?=\frac {3}{4}-\frac {17}{24}??$

$=\frac {1}{24}?$

$?=(\frac {4}{7}-\frac {3}{7})+(\frac {7}{8}+\frac {1}{8})?$

$?=\frac {1}{7}+1??$

$=\frac {8}{7}?$

$?=\frac {3}{5}+\frac {7}{5}+\frac {7}{6}??$

$=2+\frac {7}{6}??$

$=\frac {19}{6}?$

$?=3-(\frac {6}{11}+\frac {7}{11}+\frac {9}{11})??$

$=3-2??$

$=1?$

$=\frac {2}{7}+(\frac {4}{5}-\frac {1}{2})$

$=\frac {20}{70}+\frac {56}{70}-\frac {35}{70}$

$=\frac {41}{70}$

$?=1+1-\frac {1}{16}??$

$=1\frac {15}{16}?$

$ \begin{aligned} 解：0.4x&=10 \\ x&=25 \\ \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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