2x²-4x+3-3x²-5x+2
4x²-{-3x²-[5x-x²-(2x²-x)]+4x},其中x=½
3x⁷*x⁴+2x*x²*x⁴-4x⁵*(-x)²
(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
计算[(x²-5x+6)/(x²-4x+3)]+[(x²-4x+3)/(x²-2
|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|
(2x-6)/(x²-4x+4)÷(3-x)/(x²+6x+9)×(2-x)/(x+3)
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
(x+1)/(x²+3x+2)+(x²-2x)/(x²-4)
计算:2X²-5X+X²+4X-3X²-2
x(x²-1)+2x²(x+1)-3x(2x-5)计算