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應該是大於6,該函數在定義域(6,+∞)上為增函數(y隨x的增大而增大)(二次項係數大於0,開口向上),這個定義域的意思是f(x)x取值為6<x<+∞區間上時遞增,所以應該是大於6,定義域(a,b)的區間是a<x<b
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