1/1×3+1/3×5+1/5×7+1/7×9+…+1/(2n-1)(2n+1)
=(1/2)×[1/1-1/3+1/3-1/5+……+1/(2n-1)-1/(2n+1)]
=(1/2)×[1-1/(2n+1)]
=n/(2n+1)
1/1×3+1/3×5+1/5×7+1/7×9+…+1/(2n-1)(2n+1)的值(n为正整数)
1/1×3+1/3×5+1/5×7+1/7×9+…+1/(2n-1)(2n+1)的值(n为正整数)
数学人气:340 ℃时间:2020-03-25 20:56:54
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