(1-1/(x-2))÷(3-x)/(2x-4)
x(2-1/x)+x/(x^2-2x)÷(3-x)/(x^2-4)
(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
|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|
x^2-x/x+1÷x/x+1 ;x^2+6x+9/x^2-9÷x+2/x-3;2/a÷4/a
x^4+x^3+x^2+x+1=0,x^2006+x^2005+x^2004+x^2003+x^2002
|x^2-3x-4|>x+1
x^2-1/x^2+4x+4÷(x+1)×x^2+3x+2/x-1计算
x-1)(X-2)(x-3)...(x-50)+x(x-2)(X-3)...(X-50)+...+x(x-1)(x-2)
x-2/x-1÷(x+1-3/x-1)
先化简,再求值:[x+2/(x^2-2x)-(x-1)/(x^2-4x+4)]÷2x-8/(x^3-2x^2)