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1/x(x-1)+1/x(x+1)+1/(x+1)(x+20.+1/(x+9)(x+10)=11/12

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1/x(x-1)+1/x(x+1)+1/(x+1)(x+20.+1/(x+9)(x+10)=11/12
知道的回答!
1/x(x-1)+1/x(x+1)+1/(x+1)(x+20.+1/(x+9)(x+10)=11/12
原式=1/[x-1]-1/x+1/x-1/[x+1]+1/[x+1]-1/[x+2]+...+1/[x+9]-1/[x+10]=11/12
1/[x-1]-1/[x+10]=11/12
11/[x-1][x+10]=11/12
[x-1][x+10]=12
x=2或x= -11
如果3x*x-x=1那么9x*x*x*x+12x*x*x-3x*x-7x+2001等于多少 1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550 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 |X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10| x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x x+1 x x 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 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/x平方-x+2=2x/x+1 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-50)+x(x-2)(X-3)...(X-50)+...+x(x-1)(x-2) 解方程:x(x-1)/1+x(x+1)/1…+(x+9)(x+10)/1=11?12