计算:(1)3×(-5)=______;(2)(-5)×(-4)=______;(3)-2×0=______;(4)(-213)×914=______;(5)(

计算:(1)3×(-5)=______;(2)(-5)×(-4)=______;(3)-2×0=______;(4)(-213)×914=______;(5)(

题型:解答题难度:一般来源:不详
计算:
(1)3×(-5)=______;
(2)(-5)×(-4)=______;
(3)-2×0=______;
(4)(-2
1
3
)×
9
14
=______;
(5)(-1)×(-2)×(-3)=______;
(6)(-3)×(+2)×(-5)=______.
答案
(1)3×(-5),
=3×5,
=15;

(2)(-5)×(-4),
=5×4,
=20;

(3)-2×0=0;

(4)(-2
1
3
)×
9
14

=-
7
3
×
9
14

=-
3
2


(5)(-1)×(-2)×(-3),
=-1×2×3,
=-6;

(6)(-3)×(+2)×(-5),
=3×2×5,
=30.
故答案为:15;20;0;-
3
2
;-6;30.
举一反三
计算:(
1
4
-
1
5
)×20
=______.
题型:填空题难度:一般| 查看答案
计算:
(1)-2×7×(-4)×(-2.5).
(2)
2
3
×(-
9
7
)×(-24)×(+1
3
4
).
(3)(-4)×499.7×
5
7
×0×(-1).
题型:解答题难度:一般| 查看答案
计算:
(1)(-7.6)×0.5;
(2)(-3
1
2
)×(-2
1
3
);
(3)8×(-
3
4
)×(-4);
(4)21×(-71)×0×43;
(5)(-1
1
2
)×(-1
1
3
)×(-1
1
4
)×(-1
1
5
)-(-1
1
6
)×(-1
1
7
);
(6)(1-
1
2
)×(1+
1
2
)×(1-
1
3
)×(1+
1
3
)×(1-
1
4
)×(1+
1
4
).
题型:解答题难度:一般| 查看答案
计算:
(1)(-7)×(-
4
3
)×
5
14

(2)9
2
5
×15.
(3)(
7
9
-
5
6
+
3
4
-
7
18
)×36.
题型:解答题难度:一般| 查看答案
计算:
(1)6×(-10)×0.1×
1
3

(2)30×(
1
2
-
2
3
+0.4).
(3)4.98×(-5).
(4)4×(-12)+(-5)×(-8)-16.
题型:解答题难度:一般| 查看答案
最新试题
热门考点

超级试练试题库

© 2017-2019 超级试练试题库,All Rights Reserved.