怎么做!!!要过程!!!
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(1) =1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6=1-1/6=5/6
(2) =1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+……+1/n-1/(n+1)=1-1/(n+1)=n/(n+1)
(3) =1/2[1-1/3+1/3-1/5+1/5-1/7+……+1/(2n-1)-1/(2n+1)]
=1/2[1-1/(2n+1)]
=n/(2n+1)
(2) =1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+……+1/n-1/(n+1)=1-1/(n+1)=n/(n+1)
(3) =1/2[1-1/3+1/3-1/5+1/5-1/7+……+1/(2n-1)-1/(2n+1)]
=1/2[1-1/(2n+1)]
=n/(2n+1)
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