因式分解 1、3-6x+3x 2、x²+2x+1-y² 3、x(x+y)-x-y 4、x²-y²-2x+1
问题描述:
因式分解 1、3-6x+3x 2、x²+2x+1-y² 3、x(x+y)-x-y 4、x²-y²-2x+1
答
3-6x+3x=3-3x=3(1-x) x²+2x+1-y²=(x+1)²-y²=(x+1+y)(x+1-y)
x(x+y)-x-y=x(x+y)-(x+y)=(x-1)(x+y)
x²-y²-2x+1=x²-2x+1-y²=(x-1)²-y²=(x-1+y)(x-1-y)