问题标题：
分解因式：(2a-b)²+2a-b2（x-1)²-x+19(x+y)²-4(x-y)²还有(x+y)²-4(x+y-1)4x²-25-x²+2x-1这些
问题描述：
分解因式：(2a-b)²+2a-b2（x-1)²-x+19(x+y)²-4(x-y)²
还有(x+y)²-4(x+y-1)4x²-25-x²+2x-1这些
郭清泉回答：
(2a-b)²+2a-b=(2a-b)[(2a-b)+1]=(2a-b)(2a-b+1)2（x-1)²-x+1=2(x-1)²-(x-1)=(x-1)[2(x-1)-1]=(x-1)(2x-2-1)=(x-1)(2x-3)9(x+y)²-4(x-y)²=[3(x+y)+2(x-y)][3(x+y)-2(x-y)]=(3x+3y+2x-2y)(...
刘秉毅回答：
还有两题帮忙解一下x的三次方-x²-4x+416+8xy-16x²-y²
郭清泉回答：
x³-x²-4x+4
=x²(x-1)-4(x-1)
=(x-1)(x²-4)
=(x-1)(x+2)(x-2)
16+8xy-16x²-y²
=16-(16x²-8xy+y²)
=16-(4x-y)²
=(4+4x-y)(4-4x+y)
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