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~~