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由余弦定理得 9=BC²;=AC²;+AB²;-2AC•;ABcos60º;=AC²;+AB²;-AC•;AB=(AC+AB)²;-3AC•;AB ≥(AC+AB)²;-3[(AC+AB)/2]²;=(AC+AB)²;/4, ∴AC+AB≤6, 又AC+AB>BC=3,∴3
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