问题 解答题

分解因式

(1)x3(x-y)+x(y-x)          

(2)6xy2-9x2y-y3

答案

(1)x3(x-y)+x(y-x)

=x3(x-y)-x(x-y)

=x(x-y)(x2-1)

=x(x-y)(x+1)(x-1);

(2)6xy2-9x2y-y3

=-y(9x2-6xy+y2

=-y(3x-y)2

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