一、填空题
1. $8×(-\dfrac{3}{4})×(-4)=$
2. $2\dfrac{1}{3}×(-767)×0=$
3. $(-12)×(-\dfrac{1}{2}-\dfrac{5}{6})=$
4. $8×(-1.06)×1.25=$
5. $-\dfrac{1}{9}×9.9×\dfrac{2}{11}=$
6. $1\dfrac{1}{5}×(-2\dfrac{1}{6})×2\dfrac{1}{2}=$
7. $(-8.1)×9+18.1×9=$
8. $(-2\dfrac{1}{3})×\dfrac{1}{5}+\dfrac{1}{5}×\dfrac{1}{3}=$
1. $8×(-\dfrac{3}{4})×(-4)=$
24
2. $2\dfrac{1}{3}×(-767)×0=$
0
3. $(-12)×(-\dfrac{1}{2}-\dfrac{5}{6})=$
16
4. $8×(-1.06)×1.25=$
-10.6
5. $-\dfrac{1}{9}×9.9×\dfrac{2}{11}=$
-0.2
6. $1\dfrac{1}{5}×(-2\dfrac{1}{6})×2\dfrac{1}{2}=$
$-6\dfrac{1}{2}$
7. $(-8.1)×9+18.1×9=$
90
8. $(-2\dfrac{1}{3})×\dfrac{1}{5}+\dfrac{1}{5}×\dfrac{1}{3}=$
$-\dfrac{2}{5}$
答案
1. 24
2. 0
3. 16
4. -10.6
5. -0.2
6. $-6\dfrac{1}{2}$
7. 90
8. $-\dfrac{2}{5}$
2. 0
3. 16
4. -10.6
5. -0.2
6. $-6\dfrac{1}{2}$
7. 90
8. $-\dfrac{2}{5}$
二、计算题
9. $(-7)×(-15.25)×\frac{999}{20000}×0$
10. 易错题 $(-\frac{3}{7})×0.125×(-2\frac{1}{3})×(-8)$
11. $(\frac{7}{12}-\frac{4}{15}-\frac{3}{4})×(-60)$
12. $-\frac{4}{5}×(10-1\frac{1}{4}+0.5)$
13. $4×(\frac{5}{12}-\frac{2}{3}-\frac{3}{4})×|-3|$
14. $49\frac{24}{25}×(-5)$
15. $125×(-3.67)×6×8×(-\frac{1}{6})$
16. $-13×2.69+6×1.345$
9. $(-7)×(-15.25)×\frac{999}{20000}×0$
10. 易错题 $(-\frac{3}{7})×0.125×(-2\frac{1}{3})×(-8)$
11. $(\frac{7}{12}-\frac{4}{15}-\frac{3}{4})×(-60)$
12. $-\frac{4}{5}×(10-1\frac{1}{4}+0.5)$
13. $4×(\frac{5}{12}-\frac{2}{3}-\frac{3}{4})×|-3|$
14. $49\frac{24}{25}×(-5)$
15. $125×(-3.67)×6×8×(-\frac{1}{6})$
16. $-13×2.69+6×1.345$
答案
9. 0
10. -1
11. 26
12. $-7\dfrac{2}{5}$
13. -12
14. $-249\dfrac{4}{5}$
15. 3670
16. -26.9
易错分析
10. 本题易因错数负因数的个数,从而导致积的符号错误。
10. -1
11. 26
12. $-7\dfrac{2}{5}$
13. -12
14. $-249\dfrac{4}{5}$
15. 3670
16. -26.9
易错分析
10. 本题易因错数负因数的个数,从而导致积的符号错误。
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