若X+1/X=3则X^2/X^4+X^2+1=____
若X+1/X=3则X^2/X^4+X^2+1=____
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/(x-1) -1=3/(x-1)(x+2)
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
方程x+1x+2+x+8x+9=x+2x+3+x+7x+8
若|2x-1|=1-2x,|x+1|=x+1,则x的取值范围是___.
x(2-1/x)+x/(x^2-2x)÷(3-x)/(x^2-4)
x-1)(X-2)(x-3)...(x-50)+x(x-2)(X-3)...(X-50)+...+x(x-1)(x-2)
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