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[函数] 这个导数选择题怎么做

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baxiannv posted 2022-4-28 07:01 |Read mode
Last edited by hbghlyj 2025-5-2 01:49已知函数 $f(x)=\left\{\begin{array}{l}e^{-x}, x \leq 1 \\ (x-1)^2+\frac{1}{e}, x>1 \end{array}\right.$,若函数 $g(x)=f(x)-|x-a|$,$ a \inR$的零点个数为$k$,则下列结论,正确的是()
A.若 $k=0$ ,则 $\frac54-\frac{1}{e}<a<1$ ;B.若 $k=1$ ,则 $a \geqslant 1$ 或 $a \leq \frac{5}{4}-\frac{1}{e}$ ;
C.若 $k=2$ ,则 $a>1$ 或 $a<\frac{5}{4}-\frac{1}{e}$ ;D.若 $k=3$ ,则 $a=1$ 或 $a=\frac{5}{4}-\frac{1}{e}$ .

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