因式分解:
(x-1)*(x-1)-x+1
=x方-2x+1-x+1
=x方-3x+2
利用十字相乘的法则
=(x-1)*(x-2)
提取公因式(x-1)得
(x-1)*(x-1-1)=(x-1)*(x-2)
=2(x-1)-x+1
=2x-2-x+1
=x-1
=X²-2X+1-X+1
=X²-3X+2
=(X-1)(X-2)