Question

因式分解（1）4a^2-9ab^2.(2)x^3y-4x^2y^2+4xy^3

Answer 1

（1）4a^2-9ab^2=a(4a-9b^2).

(2)x^3y-4x^2y^2+4xy^3=xy(x^2-4xy+4y^2)=xy(x-2y)^2

估计第一题你打错了,应该是（1）4a^3-9ab^2=a(4a^2-9b^2)=a(2a+3b)(2a-3b).