(2x-3)(x+1)+(3-2x)²-(2x-3)(3x+1)=20
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
x-1)(X-2)(x-3)...(x-50)+x(x-2)(X-3)...(X-50)+...+x(x-1)(x-2)
解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
①2(x+3)(x-3)=x²+(x-1)(x+1)+2x
x^4+x^3+x^2+x+1=0,x^2006+x^2005+x^2004+x^2003+x^2002
1+x+x^2+x^3+.+x^99+x^100
(x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3
|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|
先化简再求值:(x+2/x²-2x - x-1/x²-4x+4)÷ x-4/x,其中x=3/2
3X+(X+2)+(X+1)*(X-1)=4*(X²+8)