数列回扣五基础知识看一看一、牢记概念与公式等差数列、等比数列前n项和ana1qn1(q0)ana1(n1)d通项公式等比数列等差数列(3)Sm,S2mSm,S3mS2m,仍成等比数列(Sn0)(3)Sm,S2mSm,S3mS2m,仍成等差数列(2)anamqnm(2)anam(nm)d(1)若m,n,p,qN*,且mnpq,则amanapaq(1)若m,n,p,qN*,且mnpq,则amanapaq性质等比数列等差数列易错易混想一想保温训练手不凉
Copyright@ 2020-2024 m.ketangku.com网站版权所有
黑ICP备2024021605号-1