13X-12(x+2)=0
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
3x^-12x-2根号(x^-4x+7)+13=0
若x=π/3,|x+1|+|x+3|+...+|x+13|-|x+2|-|x+4|-...-|x+12|
已知2x*x+x-5=0,求代数式6x*x*x+7x*x-13x+11的值
已知6x^3+13x^2-19x-12=(x+3)(3x-4)(2x+1),求12x^3+19x^2-13x-6=0的根
f(x)={x^2+x(x≤0),-x^2+x(x>0)
(x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2
x^4+x^3+x^2+x+1=0,x^2006+x^2005+x^2004+x^2003+x^2002
(2x^-5x+2/6x^+13x+6)*(6x^-5x-6/6x^-17x+10)*(12x^+8x-15/2x^-x
若x^2-8x+13=0求(x^4-6x^3-2x^2+18x+23)
解方程(x²+3x+2)(x²-2x-1)(x²-7x+12)+24=0
x^2+8x+12=0