分解因式;1.x²-2x-3 2.x²-2xy+y²-2x+2y+1
问题描述:
分解因式;1.x²-2x-3 2.x²-2xy+y²-2x+2y+1
答
1.x²-2x-3
=(x-3)(x+1)
2.x²-2xy+y²-2x+2y+1
=(x-y)²-2(x-y)+1
=(x-y-1)²