问题标题：
一道美国数学题,主要看不太懂.关于建立function的,请教大师.财富不多,已倾尽全囊.Avariablestarisonewhosebrightnessalternatelyincreasesanddecreases.Foronesuchstar,thetimebetweenperiodsofmaximumbrightness
问题描述：
一道美国数学题,主要看不太懂.关于建立function的,请教大师.财富不多,已倾尽全囊.
Avariablestarisonewhosebrightnessalternatelyincreasesand
decreases.Foronesuchstar,thetimebetweenperiodsofmaximum
brightnessis6.0days,theaveragebrightness(ormagnitude)ofthestaris5.0,anditsbrightnessvariesby±0.25magnitude.Findafunctionthatmodelsthebrightnessofthestarasafunctionoftime(indays),t.(Assumethatatt=0thebrightnessofthestaris5.0andthatitisincreasing.)
求解析和解答...不是goole翻译~~
黎卓虹回答：
所谓变星,就是指亮度一会儿增大一会儿减小的星体.假设有一颗变星到达最大亮度的周期是6.0天,其亮度的平均值为5.0,其亮度的变化幅度为±0.25,请对该变星的亮度建模,将其表述成以时间t（单位：天）的函数.（假定当其亮...
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