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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