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應該說是一個分段函數當x≤1時,f(x)=4x-4,值域為(-∞,0〕g(x)=log2 x的值域為(-∞,0〕,但此時定義域為(0,1)所以此範圍必有兩個交點.當x>;1時,f(x)=x^2 -4x+3=(x-2)^2-1,開口向上,值域(-1,+∞)g(x…
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