3x+(100-x)=300

（X+X)+(X-X)+(X*X)+(X/X)=100 2x+3x+4x+5x+x+6x+7x=100 3x=x+100 x=? 3X+(100-X)/3=100 9X+100-X=300 8X=200 X=25 3x=100+x 1X+2X+3X…+98X+99X+100X=50500X X等于多少? 1x+2x+3x+4x+5x+6x+7x…+99x=100 解方程：2x+4x+6x...+100x=1-(x+3x+5x+...+99x) x-2x+3x-4x+...+99x-100x=25 解方程：（x+100)/(x-100)=(3x+300)/(x+300) 用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+. 已知x^4+x^3+x^3+x^2+x^1+1=0,求x^100+x^99+x^98+x^97+x^96的值