问题
解答题
因式分解
(1)a2b-5ab+9b
(2)x(x-y)2-y(y-x)2.
答案
(1)a2b-5ab+9b=b(a2-5a+9);
(2)x(x-y)2-y(y-x)2,
=(x-y)(x-y)2,
=(x-y)3.
因式分解
(1)a2b-5ab+9b
(2)x(x-y)2-y(y-x)2.
(1)a2b-5ab+9b=b(a2-5a+9);
(2)x(x-y)2-y(y-x)2,
=(x-y)(x-y)2,
=(x-y)3.