a10Sn的精选

问题详情：设等差数列{an}满足3a8=5a15,且a1>0,Sn为其前n项和,则数列{Sn}的最大项为()A.S23             B.S24         C.S25          D.S26【回答】C解析设等差数列{an}的公差为d,...