1+1/(2n+1)(2n-1) 求它们的值 (n为整数)

问题描述:

1+1/(2n+1)(2n-1) 求它们的值 (n为整数)

1+1/(2n+1)(2n-1)
=(2n+1)(2n-1)/(2n+1)(2n-1)+1/(2n+1)(2n-1)
=(4n²-1+1)/(2n+1)(2n-1)
=4n²/(4n²-1)