因式分解,一道,解方程一道,答对追加分,

题目

因式分解,一道,解方程一道,答对追加分,
4x^4-2x^3y-3xy^3-9y^4 因式分解,
解x:(2/3x-2c)+3/2x-3c =7/2c
xiexie

答案

4x^4-2x^3y-3xy^3-9y^4=4x^4-9y^4-2x^3y-3xy^3={(2x^2)^2-(3y^2)^2}-xy(2x^2-3y^2)=(2x^2+3y^2)(2x^2-3y^2)-xy(2x^2-3y^2)=(2x^2-3y^2)(2x^2+3y^2-xy)(2 / (3x - 2c)) + (3 / (2x - 3c)) = 7 / 2c 设a = 3x - 2c b =...