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[函数] 一道函数零点题

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25717246 posted 2019-7-6 10:07 |Read mode
Last edited by 25717246 2019-7-6 10:30已知$f(x)=2e^x-x^2-ax-2$恰有3个零点$x_1,x_2,x_3$,且$x_1<x_2<x_3$,求$\abs{\frac{x_3}{x_1}}$的取值范围.

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facebooker posted 2019-7-6 16:10
一眼就能看出x=0是一个根 显然$x_1$不会是0.推测$x_2=0$.
然后咋做啊?

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longzaifei posted 2019-7-6 20:57
哪里的题目?

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