如何化简下列算式1/x+1/x(x+1)+1/(x+1)(x+2)+...+1/(x+2004)(x+2005) 如何求解下面的分式方程1/x(x+2)+1/(
题目
如何化简下列算式1/x+1/x(x+1)+1/(x+1)(x+2)+...+1/(x+2004)(x+2005) 如何求解下面的分式方程1/x(x+2)+1/(
答案
1/x+1/x(x+1)+1/(x+1)(x+2)+...+1/(x+2004)(x+2005)
=1/x + 1/x -1/(x+1)+1/(x+1)-1/(x+2)+...+1/(x+2004)-1/(x+2005)
=1/x+1/x-1/(x+2005)
= [2(x+2005)-x]/[ x(x+2005)]
=(x+4010)/[ x(x+2005)]
同理
1/x(x+2) =1/2 [1/X-1/(X+2)]
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