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榮要求函數f(x)=x*lg(x+2)-1的影像與x軸的交點個數有多少個 令f(x)=x*lg(x+2)-1=0 lg(x+2)=1/x 所以只需要看y=1/x和y=lg(x+2)的交點有多少個就行了
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