问题 解答题

分解因式:

(1)x3y-xy3

(2)(a+1)(a2+2a-1)+2(a+1).

答案

(1)x3y-xy3

=xy(x2-y2

=xy(x+y)(x-y);

(2)(a+1)(a2+2a-1)+2(a+1)

=(a+1)(a2+2a+1)

=(a+1)3

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