質問＜２６＞９８／７／２
from=坂田
「Σの計算」

（ΣＡｋ）＾２（ｋ＝１，２，・・・・・，ｎ）はどうやって
計算するのでしょうか？

お返事９８／７／３
from=武田

（　　）の中のΣＡｋを計算してから
２乗する
しか手はないように思えます。

お便り９８／７／６
from=Hideo Nakayama

I am a novice to personal computer;  so I have some problem with 
using special character like sigma.  If (Sigma Ak)**2 means
(A1+A2+A3+...+An)**2, I think that the solution is given as shown below: (x**2
means x squared)

      S Ak**2 + 2*S S (Ai*Aj)    

    where S stands for sigma, i.e., summation symbol.

        The first      S is summation for k = 1 to n,
        the second S is                       for i = 1 to (n -1),
        the third      S is                      for j = (i + 1) to n.
What do you think of this solution?                     Hideo Nakayam