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一道数学题:1/(1*3)+1/(3*5)+1/(5*7)+……1/(2009*2011)=1/(1*3)+1/(3*5)+1/(5*7)+……1/(2009*2011)=
题目内容:
一道数学题:1/(1*3) + 1/(3*5) +1/(5*7)+ …… 1/(2009*2011)=
1/(1*3) + 1/(3*5) +1/(5*7)+ …… 1/(2009*2011)=优质解答
1/1×3+1/3×5+1/5×7+...+1/2009×2011
=(1/2)(1-1/3+1/3-1/5+1/5-1/7+...+1/2007-1/2009+1/2009-1/2011)
=(1/2)(1-1/2011)
=(1/2)(2010/2011)
=1005/2011
1/(1*3) + 1/(3*5) +1/(5*7)+ …… 1/(2009*2011)=
优质解答
=(1/2)(1-1/3+1/3-1/5+1/5-1/7+...+1/2007-1/2009+1/2009-1/2011)
=(1/2)(1-1/2011)
=(1/2)(2010/2011)
=1005/2011
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