《2025年通城学典初中数学运算能手七年级上册人教版》

一、填空题
1. $(-16)× (-2)× (-5)=$-160
2. $0.25× (-\frac {1}{6})× 4=$$-\frac{1}{6}$
3. $(-20)× [(+\frac {1}{4})+(-\frac {1}{5})]=$-1
4. $(-8)× 9+18× 9=$90
5. $4.998× (-2)=$-9.996
6. $(-103)× 15=$-1545
7. $4× (-7)× (-125)=$3500
8. $[3× (-25)]× (-2)=$150

答案： 1. -160 2. $-\frac{1}{6}$ 3. -1 4. 90 5. -9.996 6. -1545 7. 3500 8. 150

二、计算题
9. $(-18)× [(+\frac {1}{3})-(-\frac {1}{9})]$
10. $(\frac {5}{12}-\frac {2}{3}-\frac {3}{4})× (-12)$
11. $\frac {1}{8}-0.125× 5+\frac {3}{8}× 5-0.625× 7$
12. $-(-99\frac {15}{16})× 8$
13. $(-0.125)× (-1\frac {2}{7})+(+\frac {1}{5})× (-4\frac {2}{7})+(-\frac {1}{7})× (+\frac {9}{8})$
14. $(\frac {7}{9}-\frac {5}{6}+\frac {3}{18})× 18-1.45× 6+3.95× 6$

答案： 9. -8 10. 12 11. -3 12. $799\frac{1}{2}$ 13. $-\frac{6}{7}$ 14. 17