x(3x²-5x+1)-3x²(x-2)
x(x²-1)+2x²(x+1)-3x(2x-5)计算
(x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
5x²+[x²+(5x²-2x)]-2(x²-3x),其中x=-1
((x²-5x+6)/(12-7x+x²))²÷((x²+3x+2)/(x
计算:[(-5+x)(-x-5)]² (x+3)²-(x+2)(x-1) (3x-a)(3x+a)(
6x+(2x²-3x)-(x²-1)
(2x²-2x+3)(-x³+x-1)
|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|
4x²-{-3x²-[5x-x²-(2x²-x)]+4x},其中x=½
x²+3x+9/(x²-27)+6x/(9x-x²)-(x-1)/(6+2x)