1/2x-(5x+2/3x²)-3(-1/2x+1/9x²)求化简
|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|
x²+3x+9/(x²-27)+6x/(9x-x²)-(x-1)/(6+2x)
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
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
6x+(2x²-3x)-(x²-1)
(2x²-2x+3)(-x³+x-1)
x-1)(X-2)(x-3)...(x-50)+x(x-2)(X-3)...(X-50)+...+x(x-1)(x-2)
求化简:(x^2+3x+9)/(x^2-27)+(6x)/(9x-x^2)-(x-1)/(6+2x)
(1-x/3-x)²/(3-2x-x²/9-x²)³*(x²/x
5x²+[x²+(5x²-2x)]-2(x²-3x),其中x=-1