x/2+x/8+x/12+x/20=1

x/2+x/8+x/12+x/20=1 x/2+x/6+x/12+x/20+x/30+x/42=1 1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550 (x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2 解方程(x/x(x+2))+(x/(x+2)(x+4))+.+x/(x+8)(x+10)=1 X-5+8*X=7*X-2*X-1 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 已知1+x+x^2+x^3=0,求x+x^2+x^3+x^4+x^+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+3－x+1/x+2=x+8/x+9－x+7/x+8 (3-x)/(1-x)-(5-x)/(7-x)+(x^2-x)/(x^2-8x+7)=1