分解因式:(3x-y)^2-(2x+3y)^2 (x+3)(y^2-3y+9) 4x^2-y^2-2y-1

问题描述:

分解因式:(3x-y)^2-(2x+3y)^2 (x+3)(y^2-3y+9) 4x^2-y^2-2y-1

(3x-y)^2-(2x+3y)^2
=(3x-y+2x+3y)(3x-y-2x-3y)
=(5x+2y)(x-4y)
(y+3)(y^2-3y+9)
=y³-27
4x^2-y^2-2y-1
=4x²-(y+1)²
=(2x+y+1)(2x-y-1)