将下列各式因式分解

Question

1，4x-9x³ 2,1-4{x+y}+4{x+y}²

Answer 1

6x的三次方y(x-y)的三次方-4xy的三次方(y-x)的二次方

=6x^3y(x-y)^3-4xy^3(y-x)^2

=6x^3y(x-y)^3-4xy^3(x-y)^2
=2xy(x-y)^2[3x^2(x-y)-2y^2]
=2xy(x-y)^2[3x^3-3x^2y-2y^2]本回答被网友采纳

Answer 2

本回答被提问者采纳

Answer 3

x(2-3x)(2+3x)
(2(x+y)-1)^2追问

具体过程

追答

4x-9x^3=x(4-9x^2)=x(2-3x)(2+3x)
第二题是按（a-b)^2=a^2-2ab+b^2推出