问题
解答题
分解因式:
(1)ax2-2ax+a
(2)(x-1)(x-3)+1
(3)x2(x-y)+(y-x)
答案
(1)ax2-2ax+a=a(x2-2x+1)=a(x-1)2;
(2)(x-1)(x-3)+1=x2-4x+3+1=x2-4x+4=(x-2)2;
(3)x2(x-y)+(y-x)=(x-y)(x2-1)=(x-y)(x+1)(x-1).
分解因式:
(1)ax2-2ax+a
(2)(x-1)(x-3)+1
(3)x2(x-y)+(y-x)
(1)ax2-2ax+a=a(x2-2x+1)=a(x-1)2;
(2)(x-1)(x-3)+1=x2-4x+3+1=x2-4x+4=(x-2)2;
(3)x2(x-y)+(y-x)=(x-y)(x2-1)=(x-y)(x+1)(x-1).