解方程:2x(x-1)-x(3x+2)=-x(x+2)-12
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
若x=π/3,|x+1|+|x+3|+...+|x+13|-|x+2|-|x+4|-...-|x+12|
如果3x*x-x=1那么9x*x*x*x+12x*x*x-3x*x-7x+2001等于多少
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
如果3x^3-x=1,求9x^4+12x^3-3x^2-7x+1
解方程(x²+3x+2)(x²-2x-1)(x²-7x+12)+24=0
x/2+x/8+x/12+x/20=1
f(x-1)=x^2-2x+3(x
解方程:(x^2+3x+1)/(4x^2+16x-1)-(12x^2+18x-3)/(x^2+3x+1)=2