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發表於:2020-09-13
問題詳情:已知函數且an=f(n)+f(n+1),則a1+a2+…+a99等於()A.0 B.100 C.﹣101 D.﹣99【回答】C【考點】8E:數列的求和;3T:函數的值.【分析】函數且an=f(n)+f(n+1),可得a2n=f(2n)+f(2n+1)=4n+1,a2n﹣1=f(2n﹣1)+f(2...
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發表於:2018-11-15
TheChangesofANFExpressionofCardiacMyocytesinExhaustedTrainingRats;Experimentstudyontrainingratbloodlacticacid,ANF,cortisolandinternalorgansindexlevelinfluencedbyMoxa;Effe...
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發表於:2020-08-03
問題詳情:設函數f(x)=8lnx+15x﹣x2,數列{an}滿足an=f(n),n∈N+,數列{an}的前n項和Sn最大時,n=()A.15 B.16 C.17 D.18【回答】B【考點】數列的求和.【分析】求出f(x)的導數,由導數大於0,可得增區間...