m2 |
9 |
2m |
3 |
1 |
2 |
m2 |
9 |
2m |
3 |
1 |
9 |
1 |
9 |
1 |
2 |
1 |
2 |
A.x2-4xy=x(x-4y) |
B.(x2+y2)=(x+y)2 |
C.x2+xy-6y2=(x+3y)(x-2y) |
D.x2-y2-2y-1=(x+y+1)(x-y-1) |
1 |
2 |
A.x2-4+3x=(x+2)(x-2)+3x | B.-x2+y2=-(x+y)(x-y) |
C.2x2-x=-x(-2x+1) | D.x2-2x+1=(x-1)2 |
© 2017-2019 超级试练试题库,All Rights Reserved.