问题 解答题

因式分解

(1)ax3y+axy3-2ax2y2

(2)x2(x-y)+(y-x)

答案

(1)ax3y+axy3-2ax2y2=axy(x2+y2-2xy)=axy(x-y)2

(2)x2(x-y)+(y-x)=(x-y)(x2-1)=(x-y)(x+1)(x-1).

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