f(x)=(e^x-a)^2+(a-e^-x)^2的最小值
a属于r
人气:430 ℃ 时间:2020-10-01 21:25:24
解答
划出来:f(x)=(e^x-a)^2+(a-e^-x)^2=e^2x+e^-2x-2a(e^x+e^-x)+2a^2=(e^x+e^-x)^2-2a(e^x+e^-x)+2a^2-2,因为e^x+e^-x>=2,对称轴是a,当a小于2时,e^x+e^-x=2最小,为(1-a)^2当a大于等于2时e^x+e^-x=a最小,为a^2-2...
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