在线求助完全平方公式因式分解
(1)-a²-1+2a
(2)2x²y-x²-xy²
(3)4x²-20x+25
(4)(x²+1)²-4x²
(5)(2x-y)²-2(2x-y)+1
(6)(x+y)²-2(x²-y²)+(x-y)²
人气：397 ℃ 时间：2020-03-26 02:22:09
解答
(1)-a²-1+2a =-(a^2-2a+1)=-(a-1)^2(2)2x²y-x²-xy²=-x(x-2xy+y^2) (3)4x²-20x+25 =(2x-5)^2(4)(x²+1)²-4x²=(x^2+1+2x)(x^2+1-2x)=(x+1)^2(x-1)^2(5)(2x-y)²-2(2x-y)+1...
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