1/(x^2+2x+10)+1/(x^2+11x+10)+1/(x^2-13x+10)=0

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1/(x²+2x+10)+1/(x²+11x+10)+1/(x²-13x+10)=0
去分母
(x²+11x+10)(x²-13x+10)+(x²+2x+10)(x²-13x+10)+(x²+2x+10)(x²+11x+10)=0
整理,得x⁴-29x²+100=0
x⁴-25x²-4x²+100=0
x²(x²-25)-4(x²-25)=0
(x²-25)(x²-4)=0
(x+5)(x-5)(x+2)(x-2)=0
x=5或x=-5或x=2或x=-2,代入分式方程检验,分母均不等于0,4个解均为分式方程的解.
x=5或x=-5或x=2或x=-2

1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550 解方程(x/x(x+2))+(x/(x+2)(x+4))+.+x/(x+8)(x+10)=1 |X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10| x*x+2x+x*x+10x+x*x+25+2x+x*x+1+1+16+x*x+4x*x+9-12x+16x*x+4-1 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 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), 1/x+1/x(x+1)+1/(x+1)(x+2)+1/(x+2)(x+3)+...1/(x+9)(x+10)=0 （2x-2）(x-1)=0 x(x-5)=5x-10 1x()+2x()+3x()+4x()+5x()+6x()+7x()+8x()加9x()+10x()=1980 1X?+2X?+3X?+4X?+5X?+6X?+7X?+8X?+9X?+10X?=1980求?是多少 C语言中编写s=1-x+(x*x)/2!-(x*x*x)/3!+(x*x*x*x)/4!知道最后一项的绝对值小于10的- 计算（x*x+4x+5）/（x+2）-（x*x+6x+10）/（x+3）+1