ʧһԣα߳Ϊ2
ԲΪԭ㡣ǣ
A(-1, -1/(3))B(1,-1/(3))C(0,2/(3))
ԲһΪ(x,y)õ㵽ƽ֮SΪ
\( S=(x+1)^2+(y+1/\sqrt{3})^2+(x-1)^2+(y+1/\sqrt{3})^2+x^2+(y-2/\sqrt{3})^2\)
ɵ\( S=3(x^2+y^2) +4\)Բ뾶ƽ=1/3\(x^2+y^2=1/3\)
S=5
α߳ΪaS=2.5a
���༭ʱ��: 2023-09-21 22:17:08
所跟帖: ƽÕý : Ö¤Ã÷Ì⣺ 2023-09-21 04:13:02
½âÎö¼¸ºÎ£¬ºÜstraightforward¡£2023-09-21 12:37:49 [点击:3438]
[: 1735]
(1464508)