基础达标
1 |
B |
7 |
A |
2 |
D |
8 |
D |
3 |
C |
9 |
D |
4 |
D |
10 |
A |
5 |
B |
11 |
C |
6 |
B |
|
|
12、(1)4x¹ºy³
(2)x(x+y) ²
(3)2x
13、(3x-12y+1)
14、(1)5a²b(3ab+1)
(2)-5ab(b²-4b+1)
(3)(x+y)[(x-y)-(x+y)]
=-2y(x+y)
(4)(x-y)[8a(x-y)+4b]
15、a²b+ab²=ab(a+b)=3•5=15
16、①a²-ab+ac-bc
=(a²-ab)+(ac-bc)
=a(a-b)+c(a-b)
=(a+c)(a-b)
②m²+5n-mn-5m
=m²-mn+5n-5m
=m(m-n)+5(n-m)
=(m-n)(m-5)