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y=a²;-2a-1=(a-1)^2-2定義域是(-∞,-1)∪(3,+∞) 對稱軸,x=1 (-∞,-1]在對稱軸左側,函數為减函數 當x=-1時,y有最小值=1+2-1=2 [3,+∞)在對稱軸右側,函數為增函數 當x=3時,y有最小值=9-6-1=2
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