设实数a1,a2,a3满足条件a1+a2+a3=2,则a1a2+a2a3+a3a1的最大值为
1个回答
∵ a1^2+a2^2+a3^2
>=a1a2+a2a3+a1a3
3(a1a2+a2a3+a1a3)
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