题目
题型:解答题难度:一般来源:不详
(2)(-3)×(-9)-(-5)
(3)23-17-(-7)+(-16)
(4)36×(
1 |
9 |
1 |
6 |
1 |
18 |
(5)-13-(1-0.5)×
1 |
3 |
(6)16÷(-2)3-(-
1 |
8 |
(7)化简求值5ab2+3a2b-3(a2b-
2 |
3 |
(8)化简求值2(x2y+xy2)-2(x2y-1)-3xy2-2,其中x=-2,y=
1 |
2 |
答案
=-12+15-|-15|
=-12+15-15
=-12;
(2)(-3)×(-9)-(-5)
=27+5
=32;
(3)23-17-(-7)+(-16)
=(23+7)+(-17-16)
=30+(-33)
=-3;
(4)36×(
1 |
9 |
1 |
6 |
1 |
18 |
=36×
1 |
9 |
1 |
6 |
1 |
8 |
=4-6-2
=-4;
(5))-13-(1-0.5)×
1 |
3 |
=-1-
1 |
2 |
1 |
3 |
=-1-
1 |
2 |
1 |
3 |
=
1 |
6 |
(6)16÷(-2)3-(-
1 |
8 |
=16÷(-8)-
1 |
2 |
=-2-
1 |
2 |
=-2+(-
1 |
2 |
=-
3 |
2 |
(7)5ab2+3a2b-3a2b+2ab2
=5ab2++2ab2+3a2b-3a2b
=7ab2,
当a=2,b=-1时,
原式=7×2×(-1)2=14;
(8)2x2y+2xy2-2x2y+2-3xy2-2
=2xy2-3xy2
=-xy2,
当x=-2,y=
1 |
2 |
原式=-(-2)×(
1 |
2 |
=(-2)×
1 |
4 |
=-
1 |
2 |
核心考点
试题【(1)-12+15-|-7-8|(2)(-3)×(-9)-(-5)(3)23-17-(-7)+(-16)(4)36×(19-16-118)(5)-13-(1-0】;主要考察你对有理数的混合运算等知识点的理解。[详细]
举一反三
1 |
6 |
(1)3
1 |
2 |
1 |
2 |
1 |
3 |
2 |
3 |
(2)-1
2 |
7 |
5 |
6 |
3 |
8 |
(3)-22×(-
1 |
2 |
(4)-3-[-5+(1-2×
3 |
5 |
(5)-2-12×(
1 |
3 |
1 |
4 |
1 |
2 |
①15+(-30);
②(-8)×(-7);
③23+(-17)+6-(-22);
④(-3)×
5 |
6 |
9 |
5 |
1 |
4 |
⑤(-81)÷2
1 |
4 |
4 |
9 |
⑥|-
7 |
9 |
2 |
3 |
1 |
5 |
1 |
3 |
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