《2025年一本计算题满分训练七年级数学全一册人教版》

1.【易错】$(-\frac {3}{5})×(-3\frac {1}{2})÷(-1\frac {1}{4})÷3$.

答案： 1.解:原式$=(-\frac {3}{5})×(-\frac {7}{2})×(-\frac {4}{5})×\frac {1}{3}=-(\frac {3}{5}×\frac {7}{2}×\frac {4}{5}×\frac {1}{3})=-\frac {14}{25}.$

2.$(-3\frac {1}{3})÷(-10)×(-2\frac {1}{2})$.

答案： 2.解:原式$=(-\frac {10}{3})×(-\frac {1}{10})×(-\frac {5}{2})=-(\frac {10}{3}×\frac {1}{10}×\frac {5}{2})=-\frac {5}{6}.$

3.【易错】$(-2\frac {2}{9})÷(-\frac {2}{3})×(-\frac {3}{2})$.

答案： 3.解:原式$=(-\frac {20}{9})×(-\frac {3}{2})×(-\frac {3}{2})=-5.$

4.$-1.75÷(-3\frac {1}{2})×\frac {4}{7}$.

答案： 4.解:原式$=(-\frac {7}{4})×(-\frac {2}{7})×\frac {4}{7}=\frac {7}{4}×\frac {2}{7}×\frac {4}{7}=\frac {2}{7}.$

5.$\frac {8}{15}÷32\% ×1\frac {1}{5}$.

答案： 5.解:原式$=\frac {8}{15}÷\frac {8}{25}×\frac {6}{5}=\frac {8}{15}×\frac {25}{8}×\frac {6}{5}=2.$

6.$(-1.25)×\frac {5}{4}×(-8)÷(-\frac {3}{4})$.

答案： 6.解:原式$=(-\frac {5}{4})×\frac {5}{4}×(-8)×(-\frac {4}{3})=-(\frac {5}{4}×\frac {5}{4}×8×\frac {4}{3})=-\frac {50}{3}.$

7.$\frac {15}{8}÷(-10)×(-\frac {10}{3})÷(-\frac {15}{4})$.

答案： 7.解:原式$=\frac {15}{8}×(-\frac {1}{10})×(-\frac {10}{3})×(-\frac {4}{15})=-(\frac {15}{8}×\frac {1}{10}×\frac {10}{3}×\frac {4}{15})=-\frac {1}{6}.$

8.$(-2\frac {4}{7})×(-1\frac {5}{6})÷(-1\frac {1}{21})$.

答案： 8.解:原式$=(-\frac {18}{7})×(-\frac {11}{6})×(-\frac {21}{22})=-(\frac {18}{7}×\frac {11}{6}×\frac {21}{22})=-\frac {9}{2}.$

9.$(-45)×2\frac {1}{4}÷(-4\frac {1}{2})×\frac {2}{9}$.

答案： 9.解:原式$=(-45)×\frac {9}{4}×(-\frac {2}{9})×\frac {2}{9}=45×(\frac {9}{4}×\frac {2}{9}×\frac {2}{9})=45×\frac {1}{9}=5.$

10.$(-3)÷1\frac {3}{4}×0.75×|-2\frac {1}{3}|÷9$.

答案： 10.解:原式$=(-3)×\frac {4}{7}×\frac {3}{4}×\frac {7}{3}×\frac {1}{9}=-\frac {1}{3}.$