先阅读如图所示框图,再解答有关问题:
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![](http://img.wesiedu.com/upload/c/28/c28de7dbbab5c8446351689b6d86b83a.jpg)
(1)当输入的n分别为1,2,3时,a各是多少?当输入已知量n时,猜想输出a、S的结果是什么?
(2)当输入已知量n时,请证明①输出a的结果;并写出求S的过程.
![先阅读如图所示框图,再解答有关问题:](/uploads/image/z/16744551-15-1.jpg?t=%E5%85%88%E9%98%85%E8%AF%BB%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%E6%A1%86%E5%9B%BE%EF%BC%8C%E5%86%8D%E8%A7%A3%E7%AD%94%E6%9C%89%E5%85%B3%E9%97%AE%E9%A2%98%EF%BC%9A)
(1)模拟程序框图的运行过程,知n=1时,输出a=
1
3,S=
1
3;
n=2时,输出a=
1
3×5,S=
1
3+
1
3×5;
n=3时,输出a=
1
5×7,S=
1
3+
1
3×5+
1
5×7;
,…,i
输入n时,输出a=
1
(2n−1)(2n+1),
S=
1
1×3+
1
3×5+
1
5×7+…+
1
(2n−1)(2n+1);
(2)模拟程序框图的运行过程,如下;
输入n(n≥3,且n∈N*)时,i=1,a=
1
3,S=
1
3,i≤n-1,是;
i=2,a=
1
3×(2×2−3)
2×2+1=
1
3×5,S=
1
3+
1
3×5,i≤n-1?,是;
i=3,a=
1
15(2×3−3)
2×3+1=
1
5×7,S=
1
3+
1
3×5+
1
5×7,i≤n-1?,是;
…,
i=n,a=
1
(2n−1)(2n+1),S=
1
3+
1
3,S=
1
3;
n=2时,输出a=
1
3×5,S=
1
3+
1
3×5;
n=3时,输出a=
1
5×7,S=
1
3+
1
3×5+
1
5×7;
,…,i
输入n时,输出a=
1
(2n−1)(2n+1),
S=
1
1×3+
1
3×5+
1
5×7+…+
1
(2n−1)(2n+1);
(2)模拟程序框图的运行过程,如下;
输入n(n≥3,且n∈N*)时,i=1,a=
1
3,S=
1
3,i≤n-1,是;
i=2,a=
1
3×(2×2−3)
2×2+1=
1
3×5,S=
1
3+
1
3×5,i≤n-1?,是;
i=3,a=
1
15(2×3−3)
2×3+1=
1
5×7,S=
1
3+
1
3×5+
1
5×7,i≤n-1?,是;
…,
i=n,a=
1
(2n−1)(2n+1),S=
1
3+