解方程:1/x(x+2)+1/(x+1)(x+3)+…+1/(x+8)(x+10)=0
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解方程:1/x(x+2)+1/(x+1)(x+3)+…+1/(x+8)(x+10)=0
![解方程:1/x(x+2)+1/(x+1)(x+3)+…+1/(x+8)(x+10)=0](/uploads/image/z/19145503-55-3.jpg?t=%E8%A7%A3%E6%96%B9%E7%A8%8B%3A1%2Fx%EF%BC%88x%2B2%EF%BC%89%2B1%2F%EF%BC%88x%2B1%EF%BC%89%EF%BC%88x%2B3%EF%BC%89%2B%E2%80%A6%2B1%2F%EF%BC%88x%2B8%EF%BC%89%EF%BC%88x%2B10%EF%BC%89%3D0)
1/2*[1/x-1/(x+2)]+1/2*[1/(x+1)-1/(x+3)]+…+1/2*[1/(x+8)-1/(x+10)]=0
1/2*[1/x-1/(x+2)+1/(x+1)-1/(x+3)+1/(x+2)-1/(x+4)+…+1/(x+8)-1/(x+10)]=0
1/2*[1/x+1/(x+1)-1/(x+9)-1/(x+10)]=0
所以1/x+1/(x+1)-1/(x+9)-1/(x+10)=0
[1/x-1/(x+9)]+[1/(x+1)-1/(x+10)]=0
9/[x(x+9)]+9/[(x+1)(x+10)]=0
9/[x(x+9)]=-9/[(x+1)(x+10)]
所以x(x+9)=-(x+1)(x+10)
x^2+9x=-(x^2+11x+10)
x^2+9x+x^2+11x+10=0
2x^2+20x+10=0
x^2+10x+5=0
x=-5±2√5
打字不易,
1/2*[1/x-1/(x+2)+1/(x+1)-1/(x+3)+1/(x+2)-1/(x+4)+…+1/(x+8)-1/(x+10)]=0
1/2*[1/x+1/(x+1)-1/(x+9)-1/(x+10)]=0
所以1/x+1/(x+1)-1/(x+9)-1/(x+10)=0
[1/x-1/(x+9)]+[1/(x+1)-1/(x+10)]=0
9/[x(x+9)]+9/[(x+1)(x+10)]=0
9/[x(x+9)]=-9/[(x+1)(x+10)]
所以x(x+9)=-(x+1)(x+10)
x^2+9x=-(x^2+11x+10)
x^2+9x+x^2+11x+10=0
2x^2+20x+10=0
x^2+10x+5=0
x=-5±2√5
打字不易,
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