写出数列的通项公式……①1, 3/4, 5/9, 7/16 ②2/(1*3), 4/(3*5), 6/(5*7), 8/(7*9)③11, 101, 1001, 10001④2/3, -4/9, 2/9, -8/81各位高手帮帮忙把……谢谢类!

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写出数列的通项公式……①1,3/4,5/9,7/16②2/(1*3),4/(3*5),6/(5*7),8/(7*9)③11,101,1001,10001④2/3,-4/9,2/9,-8/81各位高手帮

写出数列的通项公式……①1, 3/4, 5/9, 7/16 ②2/(1*3), 4/(3*5), 6/(5*7), 8/(7*9)③11, 101, 1001, 10001④2/3, -4/9, 2/9, -8/81各位高手帮帮忙把……谢谢类!
写出数列的通项公式……
①1, 3/4, 5/9, 7/16
②2/(1*3), 4/(3*5), 6/(5*7), 8/(7*9)
③11, 101, 1001, 10001
④2/3, -4/9, 2/9, -8/81
各位高手帮帮忙把……谢谢类!

写出数列的通项公式……①1, 3/4, 5/9, 7/16 ②2/(1*3), 4/(3*5), 6/(5*7), 8/(7*9)③11, 101, 1001, 10001④2/3, -4/9, 2/9, -8/81各位高手帮帮忙把……谢谢类!
1) (2n-1)/(n^2)
2) 2n/[(2n-1)*(2n+1)]
3) (10^n)+1
4) [(-1)^(n-1)] *(2n)/(3^n)