12-4x=3x-2

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 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 x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? 若x=π/3,｜x+1|+|x+3|+...+|x+13|-|x+2|-|x+4|-...-|x+12| 2x+3x+4x+5x+x+6x+7x=100 5x+9x=6x*2+12 x+9-x/3=4 x^3×x^5×x+(x^3)^12+4(x^6)^2=? 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 2x/(x+12)=4/3 计算2x X 4x--3x=