2x+(x+15)*4=126

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 1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550 x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? ∫(x^4-4x^2+5x-15)/(x^2+1)(x-2) dx=? 先化简,再求值：（x-2/x-x+2/x)/x-2/4x,x=2011 2x+3x+4x+5x+x+6x+7x=100 解方程(x/x(x+2))+(x/(x+2)(x+4))+.+x/(x+8)(x+10)=1 15-(4-5x)=2x+(35-3x) x^4+x^3+x^2+x+1=0,x^2006+x^2005+x^2004+x^2003+x^2002 15X(3X-8)-4X(2X+3=6X(4X-4)-4谢谢! 15x（3x-8）-4X(2X+3)=6X(4X-4)-4