化简x(x+1)分之1+(x+1)(x+2)分之1+(x+2)(x+3)分之1+.+(x+2010)(x+2011)分之一,并求当x=1时的值
人气:277 ℃ 时间:2020-04-15 02:00:19
解答
原式=1/x(x+1)+1/(x+1)(x+2)+...+1/(x+2010)(x+2011)=(1/x-1/(x+1))+(1/(x+1)-1/(x+2))+...+(1/(x+2010)-1/(x+2011))=1/x-1/(x+1)+1/(x+1)-1/(x+2)+.+1/(x+2010)-1/(x+2011)=1/x-1/(x+2011)=2011/x(x+2011)x=1;原式=...
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