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[函数] 切线的条数问题

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敬畏数学 posted 2022-9-16 14:43 |Read mode
$ f(x)=e^{x-1}+lnx $,则点$ (a,b) $可以作f(x)的两条切线的充分条件可以是:$(A)b=2a-1>1;(B)b=2a-1<1;(C)2a-1<b<f(a);
(D)b<2a-1\leqslant -1$

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