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第31页

信息发布者：

$=\frac {1}{4}+\frac {3}{4}+\frac {8}{9}$

$=1+\frac {8}{9}$

$=1 \frac {8}{9}$

$=\frac {1}{18}×(\frac {7}{9}+\frac {2}{9})$

$=\frac {1}{18}×1$

$=\frac {1}{18}$

$=\frac {1}{5}+5$

$=5 \frac {1}{5}$

$=\frac {7}{8}×(\frac {10}{9}-1)$

$=\frac {7}{8}×\frac {1}{9}$

$=\frac {7}{72}$

=10+3-4

=9

$=\frac {16}{17}×(\frac {23}{25}+\frac {11}{25})$

$=\frac {16}{17}×\frac {34}{25}$

$=\frac {32}{25}$

$400×(1+\frac {1}{4})= 500($台$)$

$120×(1-\frac {1}{5}-\frac {1}{3})=56($页$)$

$500×\frac {1}{5}$

$500× (\frac {1}{4}+\frac {1}{5})$

$500× (1-\frac {1}{4}-\frac {1}{5})$

$240×(1-\frac {5}{8})=90($棵$)$

答：苹果树有$90$棵。

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