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.
分解因式
(1)x3(x-y)+x(y-x)
(2)6xy2-9x2y-y3.
(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.