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$=\frac {9}{12}+\frac {2}{12}-\frac {8}{12}$

$=\frac {11}{12}-\frac {8}{12}$

$=\frac {1}{4}$

$=\frac {63}{72}-\frac {18}{72}+\frac {32}{72}$

$=\frac {5}{8}+\frac {32}{72}$

$=\frac {77}{72}$

$=\frac {15}{18}-(\frac {12}{18}-\frac {2}{18})$

$=\frac {15}{18}-\frac {5}{9}$

$=\frac {5}{18}$

$=\frac {12}{24}+\frac {16}{24}+\frac {15}{24}$

$=\frac {7}{6}+\frac {15}{24}$

$=\frac {43}{24}$

$=\frac {56}{70}-\frac {50}{70}+\frac {35}{70}$

$=\frac {3}{35}+\frac {35}{70}$

$=\frac {41}{70}$

$=\frac {36}{40}-(\frac {30}{40}+\frac {5}{40})$

$=\frac {36}{40}-\frac {7}{8}$

$=\frac {1}{40}$

$\frac {2}{5}+\frac {3}{8}+\frac {1}{10}$

$=\frac {16}{40}+\frac {15}{40}+\frac {4}{40}$

$=\frac {35}{40}$

$=\frac {7}{8}($吨)

答：这堆沙子原有$\frac {7}{8}$吨.

$\frac {3}{4}+\frac {3}{4}-\frac {1}{2}=1 ($米)

答：两次一共截去$1$米。

$1-\frac {1}{4}-\frac {2}{5}$

$=\frac {3}{4}-\frac {2}{5}$

$=\frac {7}{20}$

答：苹果树苗的培育的面积占这块地的$\frac {7}{20}.$

$\frac {1}{6}+\frac {1}{8}+\frac {1}{4}=\frac {13}{24}$

答：伙食、服装和水电气的费用共占总支出的$\frac {13}{24}。$

$1-\frac {13}{24}=\frac {11}{24}$

答：其他费用占总支出的$\frac {11}{24}。$

$1-\frac {1}{4}-\frac {3}{8}=\frac {3}{8}$

答：这根彩带还剩全长的$\frac {3}{8}.$

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