问题
解答题
因式分
(1)9x2y-6xy2+y3
(2)(a-b)(x+y)-(b-a)(x-y)
答案
(1)9x2y-6xy2+y3
=y(9x2-6xy+y2)
=y(3x-y)2;
(2)(a-b)(x+y)-(b-a)(x-y)
=(a-b)[(x+y)+(x-y)]
=2x(a-b).
因式分
(1)9x2y-6xy2+y3
(2)(a-b)(x+y)-(b-a)(x-y)
(1)9x2y-6xy2+y3
=y(9x2-6xy+y2)
=y(3x-y)2;
(2)(a-b)(x+y)-(b-a)(x-y)
=(a-b)[(x+y)+(x-y)]
=2x(a-b).