求和:Sn=2^/1*3+4^2/3*5+……(2n)^2/(2n-1)(2n+1)

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求和:Sn=2^/1*3+4^2/3*5+……(2n)^2/(2n-1)(2n+1)求和:Sn=2^/1*3+4^2/3*5+……(2n)^2/(2n-1)(2n+1)求和:Sn=2^/1*3+4^2

求和:Sn=2^/1*3+4^2/3*5+……(2n)^2/(2n-1)(2n+1)
求和:Sn=2^/1*3+4^2/3*5+……(2n)^2/(2n-1)(2n+1)

求和:Sn=2^/1*3+4^2/3*5+……(2n)^2/(2n-1)(2n+1)
(2n)^2/(2n-1)(2n+1)
=(2n)^2/[(2n)²-1]
=1+1/[(2n)²-1]
=1+1/(2n-1)(2n+1)
=1+1/2[1/(2n-1)-1/(2n+1)]
∴Sn=2^2/1*3+4^2/3*5+……(2n)^2/(2n-1)(2n+1)
=n+1/2[1-1/3+1/3-1/5+...+1/(2n-1)-1/(2n+1)]
=n+1/2[1-1/(2n+1)]
=n+n/(2n+1)
这是我在静心思考后得出的结论,
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