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原方程可化為lnx=-2x+8,則原方程的根即為函數y=lnx和函數y=-2x+8圖象交點的橫坐標,在同一坐標系內做出這兩個函數的圖象:由圖象可以看出只有一個交點,所以原方程只有一個實數根.故答案選B
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