A.-m2-n2=-(m-n)(m+n) | B.x2-x+
| ||||
C.y3-y=y(y2-1) | D.x2-2x+3=(x-1)2+2 |
1 |
4 |
A.1个 | B.2个 | C.3个 | D.4个 |
A.(x2+y2-4)2 | B.(x-y)4 | C.(x2-y2-4)2 | D.(x2+y2+4)2 |
A.x2y2-z2=x2(y+z)(y-z) |
B.-x2y+4xy-5y=-y(x2+4x+5) |
C.(x+2)2-9=(x+5)(x-1) |
D.9-12a+4a2=-(3-2a)2 |
© 2017-2019 超级试练试题库,All Rights Reserved.