（X2-3X）2-(3X-1)2
=(x^2-3x)^2-(3x-1)^2
=(x^2-3x-3x+1)(x^2-3x+3x-1)
=(x^2-1)(x^2-6x+1)
=(x-1)(x+1)(x^2-6x+1)^这个是什么次方符号（X²-3X）²-(3X-1)²=(x²-3x)²-(3x-1)²=(x²-3x-3x+1)(x²-3x+3x-1)=(x²-1)(x²-6x+1)=(x-1)(x+1)(x²-6x+1)