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一、填空题
1. $(-16)×(-2)×(-5)=$
2. $0.25×(-\dfrac{1}{6})×4=$
3. $7×(-\dfrac{3}{4})×(-4)=$
4. $2\dfrac{1}{3}×(-212)×0=$
5. $(-4)×(-18.36)×2.5=$
6. $8×(-3.56)×1.25=$
1. $(-16)×(-2)×(-5)=$
-160
2. $0.25×(-\dfrac{1}{6})×4=$
$-\dfrac{1}{6}$
3. $7×(-\dfrac{3}{4})×(-4)=$
21
4. $2\dfrac{1}{3}×(-212)×0=$
0
5. $(-4)×(-18.36)×2.5=$
183.6
6. $8×(-3.56)×1.25=$
-35.6
答案
1. -160
2. $-\dfrac{1}{6}$
3. 21
4. 0
5. 183.6
6. -35.6
2. $-\dfrac{1}{6}$
3. 21
4. 0
5. 183.6
6. -35.6
7. $-\dfrac{1}{8} × 5.6 × \dfrac{2}{7} =$
8. $1\dfrac{1}{5} × (-2\dfrac{5}{6}) × 2\dfrac{1}{2} =$
-0.2
8. $1\dfrac{1}{5} × (-2\dfrac{5}{6}) × 2\dfrac{1}{2} =$
$-\dfrac{17}{2}$
答案
7. -0.2
8. $-\dfrac{17}{2}$
8. $-\dfrac{17}{2}$
二、计算题
9. $(-56)×(+\dfrac{1}{3})×(-9)×(+\dfrac{1}{8})$
10. $321×(-123)×\dfrac{312}{231}×0$
11. $125×(-5.76)×7×8×(-\dfrac{1}{7})$
12. $(-5)×8×(-1\dfrac{4}{5})×(-1.25)$
13. $(-\dfrac{4}{7})×0.125×(-1\dfrac{3}{4})×(-8)$
14. $\dfrac{5}{31}×(-\dfrac{2}{9})×(-2\dfrac{1}{15})×(-4\dfrac{1}{2})$
15. 易错题 $(+1)×(+2)×···×(+202)×(+203)×(-\dfrac{1}{203})×(-\dfrac{1}{202})×···×(-\dfrac{1}{2})×(-1)$
9. $(-56)×(+\dfrac{1}{3})×(-9)×(+\dfrac{1}{8})$
10. $321×(-123)×\dfrac{312}{231}×0$
11. $125×(-5.76)×7×8×(-\dfrac{1}{7})$
12. $(-5)×8×(-1\dfrac{4}{5})×(-1.25)$
13. $(-\dfrac{4}{7})×0.125×(-1\dfrac{3}{4})×(-8)$
14. $\dfrac{5}{31}×(-\dfrac{2}{9})×(-2\dfrac{1}{15})×(-4\dfrac{1}{2})$
15. 易错题 $(+1)×(+2)×···×(+202)×(+203)×(-\dfrac{1}{203})×(-\dfrac{1}{202})×···×(-\dfrac{1}{2})×(-1)$
答案
9. 21
10. 0
11. 5760
12. -90
13. -1
14. $-\dfrac{1}{3}$
15. -1
15. 本题易在运用乘法交换律和乘法结合律进行简便运算时出现因数搭配错误,从而导致结果错误.
10. 0
11. 5760
12. -90
13. -1
14. $-\dfrac{1}{3}$
15. -1
15. 本题易在运用乘法交换律和乘法结合律进行简便运算时出现因数搭配错误,从而导致结果错误.
