登录
一、填空题
1. $(-16)×(-28)×(-\dfrac{1}{28})=$
2. $0.125×(-\dfrac{1}{5})×8=$
3. $4.998×(-2)=$
4. $(-8)×9+18×9=$
5. $(-103)×15=$
6. $[3×(-25)]×(-2)=$
7. $4×(-7)×(-125)=$
8. $(-20)×[(+\dfrac{1}{4})+(-\dfrac{1}{5})]=$
1. $(-16)×(-28)×(-\dfrac{1}{28})=$
-16
2. $0.125×(-\dfrac{1}{5})×8=$
$-\dfrac{1}{5}$
3. $4.998×(-2)=$
-9.996
4. $(-8)×9+18×9=$
90
5. $(-103)×15=$
-1 545
6. $[3×(-25)]×(-2)=$
150
7. $4×(-7)×(-125)=$
3 500
8. $(-20)×[(+\dfrac{1}{4})+(-\dfrac{1}{5})]=$
-1
答案
1. -16
2. $-\dfrac{1}{5}$
3. -9.996
4. 90
5. -1 545
6. 150
7. 3 500
8. -1
2. $-\dfrac{1}{5}$
3. -9.996
4. 90
5. -1 545
6. 150
7. 3 500
8. -1
二、计算题
9. $(-108)×(\dfrac{1}{3}-\dfrac{1}{9}+0.25)$
10. $(-7)×(-2.5)×(-1\dfrac{3}{7})×4$
11. $15\dfrac{1}{2}×(-\dfrac{4}{5})$
12. 易错题 $(-\dfrac{5}{11})×(-\dfrac{8}{13})×(-2\dfrac{1}{5})×(-\dfrac{3}{4})$
13. $(-4.75)×(+4)+4.75×15-4.75×(+2)-(-4.75)$
14. $(\dfrac{7}{9}-\dfrac{5}{6}+\dfrac{3}{18})×18-1.42×6+3.95×6-(-0.6)×(-0.3)$
9. $(-108)×(\dfrac{1}{3}-\dfrac{1}{9}+0.25)$
10. $(-7)×(-2.5)×(-1\dfrac{3}{7})×4$
11. $15\dfrac{1}{2}×(-\dfrac{4}{5})$
12. 易错题 $(-\dfrac{5}{11})×(-\dfrac{8}{13})×(-2\dfrac{1}{5})×(-\dfrac{3}{4})$
13. $(-4.75)×(+4)+4.75×15-4.75×(+2)-(-4.75)$
14. $(\dfrac{7}{9}-\dfrac{5}{6}+\dfrac{3}{18})×18-1.42×6+3.95×6-(-0.6)×(-0.3)$
答案
9. -51
10. -100
11. $-12\dfrac{2}{5}$
12. $\dfrac{6}{13}$
12. 运用乘法交换律交换因数的位置时,要连同符号一起交换,不要漏掉符号.
13. 47.5
14. 17
10. -100
11. $-12\dfrac{2}{5}$
12. $\dfrac{6}{13}$
12. 运用乘法交换律交换因数的位置时,要连同符号一起交换,不要漏掉符号.
13. 47.5
14. 17
