設區域D由曲線圍成，則
設函數f(x)=ln(3x)，則'f(2)=（）
Weregretto________thatitmaynotbepossibletodealwitheveryrequest.
ShegotajobasanassistantstagemanagerattheCambridgeArtsFestivalTheatre,thinkingthatitmight________toacareerasaplaywright(劇作家).
隨機變量X的概率分布Y表示X被3除的余數，則E(Y)=______.
