1/3=5/12x-x/4 2/3-8x=3-1/2x 0.5x-0.7=6.5-1.3x 1/6（3x-6）=2/5x

（1） x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8 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 y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1 已知1+x+x^2+x^3=0,求x+x^2+x^3+x^4+x^5+x^6+x^7+x^8的值 设函数f(x)=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10), (X+2)/(X+1)-(X+4)/(X+3)=(X+6)/(X+5)-(X+8)/(X+7) 解方程 x+2/x+1+x+8/x+7=x+6/x+5+x+4/x+3 解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6) x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.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)