10/04/29 03:00:51
>>54
2 (a^2 + b^2 + c^2 - ab-bc-ca)
= (a-b)^2 + (b-c)^2 + (c-a)^2 ≧ 0
10/04/29 03:00:51
>>54
2 (a^2 + b^2 + c^2 - ab-bc-ca)
= (a-b)^2 + (b-c)^2 + (c-a)^2 ≧ 0
10/04/29 03:00:51
>>54
2 (a^2 + b^2 + c^2 - ab-bc-ca)
= (a-b)^2 + (b-c)^2 + (c-a)^2 ≧ 0