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對數函數y=log(a為底)x中,x>0時,值域為R 而y=log以0.5為底(x^2-2x+a)值域是R, 表明對數(x^2-2x+a)可以取到>0的任意值,否則y值必缺失一部分值; 而x^2-2x+a=(x-1)^2+a-1≥a-1 要(x^2-2x+a)保證取到>0的任意值,應有: a-1≤0 a≤1
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