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一隐含条件在已知信息中例1已知01. (D)不确定. 分析:注意到两已知等式结构上的一致,不难得出B1,B2是方程loga=x-1的两个根.则y=logax与y=x-1的图像有两个交点.作出图像,当01时,由02-1=1.选(C).
An implicit condition in the known information in Example 1 is known 0 1. (D) Uncertainty. Analysis: Note that the two known equations are consistent in structure, and it is not difficult to conclude that B1 and B2 are the two roots of the loga=x-1 equation. Then the image of y=logax and y=x-1 has two intersection points. To make the image, when 01, it is 02-1=1. election (C).