应是分解a^2(a-b)+(b-a)(x-y)^2-2(y-x)+1

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应是分解a^2(a-b)+(b-a)(x-y)^2-2(y-x)+1
应是分解
a^2(a-b)+(b-a)
(x-y)^2-2(y-x)+1

应是分解a^2(a-b)+(b-a)(x-y)^2-2(y-x)+1
a^2(a-b)+(b-a)
=(a²-1)·(a-b)
=(a+1)·(a-1)·(a-b)
(x-y)^2-2(y-x)+1
=(x-y)^2+2(x-y)+1
=[(x-y)+1]²
=(x-y+1)²

1,
(a-b)(a+1)(a-1)
2,
(x-y+1)^2

a^2(a-b)+(b-a)=(a^2-1)*(a-b)=(a+1)*(a-1)*(a-b)
(x-y)^2-2(x-y)+1=(x-y-1)^2