A.15a2+5a=5a(3a+1) |
B.-x2-y2=-(x2-y2)=-(x+y)(x-y) |
C.k(x+y)+x+y=(k+1)(x+y) |
D.1-a2-b2+2ab=(1+a-b)(1-a+b) |
A.(2x-3)(2x+3)=4x2-9 | B.4x2+8x-1=4x(x+2)-1 |
C.4x2-9=(2x+3)(2x-3) | D.a2-9+2a=(a+3)(a-6) |
A.m+1 | B.m | C.m-1 | D.以上都不对 |
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