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第31頁(yè)

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$\frac{1}{4}$

$\frac{29}{28}$

$\frac{11}{24}$

$\frac{1}{2}$

$\frac{5}{18}$

$\frac{5}{36}$

$\frac{5}{6}$

$\frac{2}{3}$

$ \begin{aligned}解：x&=\frac {2}{3}-\frac {1}{9} \\ x&=\frac {5}{9} \\ \end{aligned}$

$ \begin{aligned} 解：x&=\frac {5}{6}+\frac {5}{8} \\ x&=\frac {35}{24} \\ \end{aligned}$

$ \begin{aligned} 解：5x&=\frac {3}{8}+\frac {5}{8} \\ 5x&=1 \\ x&=\frac {1}{5} \\ \end{aligned}$

$ \begin{aligned} 解：x+\frac {1}{5}&=\frac {2}{3} \\ x&=\frac {7}{15} \\ \end{aligned}$

$?=\frac {7}{8}+\frac {6}{8}+\frac {1}{3}?$

$?=\frac {13}{8}+\frac {1}{3}$

$??=\frac {47}{24}?$

$?=\frac {5}{6}-\frac {8}{15}??$

$=\frac {3}{10}?$

$?=5-(\frac {5}{11}+\frac {17}{11})??$

$=5-2$

$??=3?$

$?=(\frac {23}{15}+\frac {7}{15})-(\frac {7}{12}+\frac {5}{12})??$

$=2-1??$

$=1?$

$?=\frac {10}{21}+\frac {11}{21}-1??$

$=1-1??$

$=0?$

$?=(\frac {2}{3}+\frac {1}{3})-(\frac{5}{12}+\frac {7}{12})??$

$=1-1??$

$=0?$

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