X^2-3X-1=12/(X^2-3X)
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
解方程:2x(x-1)-x(3x+2)=-x(x+2)-12
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)
x^4+x^3+x^2+x+1=0,x^2006+x^2005+x^2004+x^2003+x^2002
x-1)(X-2)(x-3)...(x-50)+x(x-2)(X-3)...(X-50)+...+x(x-1)(x-2)
若x=π/3,|x+1|+|x+3|+...+|x+13|-|x+2|-|x+4|-...-|x+12|
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
已知 X=4- 根号3 求 (X*X*X*X-6X*X*X-2X*X+18X+23) / (X*X-8X+15)的值
1+x+x^2+x^3+.+x^99+x^100
f(x-1)=x^2-2x+3(x
(x+3)×(x+2)×(x+1)×x=3024