等差中项
![等差中项图册_百度百科](https://imgs.wantubizhi.com/img/A1A61BAA66193547F3A6DD7D8EE527E9461A836EE3A15D3B7F1ACC594BE03727A7F064EDEA3DEECBF0C74ED51E5B0587D2375C37C2DCF5DDD52B0C3053DE35CEEA748C8EB9CDD3E3C6A4A47A69F655E31800D4FF7A96DAC85529E6B9C215F983)
等差中项图册_百度百科
图片尺寸658x313![等差数列通项公式](https://imgs.wantubizhi.com/img/A1A61BAA66193547F3A6DD7D8EE527E9C14A0119E925BD253CBE4084184758969FA677690E5680F2F73565DFFF27E43A2FDCA5C43D8A0A0F5F345E121F5388C07095F78D1537CE1D9BE8F5561A3205CE81C0AE855169C2192C42F6CC8CF9AEE6)
等差数列通项公式
图片尺寸920x1302![在等差数列{an}中,s6=60,且a6为a1和a21的等比中项 1,求an及sn 2,若bn](https://imgs.wantubizhi.com/img/735A5D1F980B52A636CC46F12F2D1A73F3D7B8E8E0572121D6852DD88EFFBDD91A1191095C3BC18762E39A70057DDD6C9497591975AC13B43A62964A613B13348330AEE66F21D3F78379A55AE07E1033CDAFB655B66E0F59865082357B48770A)
在等差数列{an}中,s6=60,且a6为a1和a21的等比中项 1,求an及sn 2,若bn
图片尺寸645x377![在等差数列{an}中,s6=60,且a6为a1和a21的等比中项 1,求an及sn 2,若bn](https://imgs.wantubizhi.com/img/ADDA3C5D760C6828B77B505A29D43E83A60671A866EA722E16EC230D1ABB413DC50CD427314CA3AC1839175EB24FBE53EB2E2425C3D641F1B189FFC6AA25275EE843E4FDE8C6A945579ADD472A83F6B31A436429F2687B9DAD8398F92BD499BD)
在等差数列{an}中,s6=60,且a6为a1和a21的等比中项 1,求an及sn 2,若bn
图片尺寸450x328![一等差中项的性质](https://imgs.wantubizhi.com/img/735A5D1F980B52A636CC46F12F2D1A732C34011CA73924FD76437C3639D4B9892DB6B022B4A8DBBBBC47E52B514D3665AFB1B3216EC68CB3948869EBB9D55359484272CFEF2E10100584717FB3F154E6874453B0046436B77959174F017919F9)
一等差中项的性质
图片尺寸1080x810![请问等差中项求和公式是什么?(为奇数,偶数时)比如知道a7是12,求s13?](https://imgs.wantubizhi.com/img/735A5D1F980B52A636CC46F12F2D1A73D710A89DEBBDC98FC66B32FB96AA335DCA9CE9BB300858B83180D25D4785545A86C269C5B66172C0A17404ADE4FEE6676FE0D6694DA249229BDB0B90D3B376BB9C0256F693589AFE9518913B8C99BE76)
请问等差中项求和公式是什么?(为奇数,偶数时)比如知道a7是12,求s13?
图片尺寸612x816![2017高考数学公式:等差数列的通项公式](https://imgs.wantubizhi.com/img/ADDA3C5D760C6828B77B505A29D43E83B0157F9D063F21F88E2E9C952D827B999D937689421E176E268B037E0A75404CFAAF334DAD61C398B67993F928EFD4FC462E681C1DCA1DD425CE25EAC118E4B9A75051EBA9D6C3346ED26BA14A191984)
2017高考数学公式:等差数列的通项公式
图片尺寸473x213![行测等差数列还在用普通公式?你out啦](https://imgs.wantubizhi.com/img/A1A61BAA66193547F3A6DD7D8EE527E975269008C367D894EFC4E42F4B04661D94C41F10E75F49AF319AE67B7B4B909169DDA9085B0EFE460D19A37A605835130AE0D0635D240D4ACB58C3751C0C297ABEF7D2F562B1A96552C1BD065CC3EFAC)
行测等差数列还在用普通公式?你out啦
图片尺寸466x236![等差数列中项求和公式 - 百度文库](https://imgs.wantubizhi.com/img/A1A61BAA66193547F3A6DD7D8EE527E90012BE2BF510EFD3F110EBD7C5D4809630E2094F69FCE723C50FFBDECC42394CD5FD9CEC6DDFC4E4C16471B8942D21344912EF42E6EA090ECA8CF66903BC573239F970F99ABA9BA4C9FA4606A036D59B)
等差数列中项求和公式 - 百度文库
图片尺寸500x375![等差数列的前n项和教案教师资格面试高中数学](https://imgs.wantubizhi.com/img/A1A61BAA66193547F3A6DD7D8EE527E9A72FD7A77AF77889ED83793FA88FBBC17A4C55EAE135E2C923F1A7FAF96E96BCFAA9BA43FAA95C54EEB9642386053276D6C9EDD186142D59F6CADDB3994B5EA9C9953B1DD720EF11E31CB073FCEE3361)
等差数列的前n项和教案教师资格面试高中数学
图片尺寸516x321![5等比数列前n项和的性质ppt](https://imgs.wantubizhi.com/img/A1A61BAA66193547F3A6DD7D8EE527E9DFD861B6BF5670F770454DB87028DA6FFEA3154B045B4937D15E900E21E84423BCB54B24C712EA27CE94366FC092A3CE6DABF393F4A4EE41F71D7AB0BDE4F708FD34A7A6985F73F3047CFA3387A619BC)
5等比数列前n项和的性质ppt
图片尺寸1080x810![等差数列的项数怎么求啊?有公式?真的不会求项数啊!](https://imgs.wantubizhi.com/img/A1A61BAA66193547F3A6DD7D8EE527E91A03342C454F7F37B5EE8C220FF243A4A341B07FE7C28C9DE1B09292BCE48B8975B4278F1AD778758C082E16999DF8B33BE7BAFA88AC70DF3D8BAAF292A83169B47421945C3A6ED4DA6102599E639FB7)
等差数列的项数怎么求啊?有公式?真的不会求项数啊!
图片尺寸612x816![等差数列的前n项和doc](https://imgs.wantubizhi.com/img/A1A61BAA66193547F3A6DD7D8EE527E92E8392B4E493DDCE149B421FBF339FDD81FDB5616878524EDE744EDE083B429953A06FCFA6A52E695A3152F458EF376874EE3E9429CDCE3CEF653EEB11E225D2B39FAA97E5CC86ADB77E1DDDF7A09FD9)
等差数列的前n项和doc
图片尺寸920x1301![专题闯关教学课件:等差数列,等比数列(共32张ppt) (4) 等差中项公式](https://imgs.wantubizhi.com/img/ADDA3C5D760C6828B77B505A29D43E83882F5068DB7DB5408C04670967695393A40E4C5133AE35B279AFBF0A15FD9042E8A0D425491A11580DF390DB061017A75BA1F518F7AC325ABE2FB3DB39BAFEA41ACBEB2C4E7A5A3700F458B4DD806B36)
专题闯关教学课件:等差数列,等比数列(共32张ppt) (4) 等差中项公式
图片尺寸1080x810![等差中项 由三个数a,a,b组成的等差数列中,a __叫做a与b的等差 a .](https://imgs.wantubizhi.com/img/A1A61BAA66193547F3A6DD7D8EE527E90BB9EE522560F2DCA4DFBD81EA2859AFF877BDF13970AA956FABB40B3106153ECDA6A2989E82EDAE21003224D6257112DAD53A33BB2C99CA2C436D55DC8615B2997B021FDCC17FE525A0CED73F989C88)
等差中项 由三个数a,a,b组成的等差数列中,a __叫做a与b的等差 a .
图片尺寸1080x810![等差数列各项都不是0,既an=/0,求前2n 1项奇数项和偶数项和的比](https://imgs.wantubizhi.com/img/ADDA3C5D760C6828B77B505A29D43E830C9171689A614CC66A78E11B07D32C8756E2991D0306AA912965649808F5273DC9636159F50195BC2ACC13E6646EDBB0335C5DD6EEF32C67CFDF6D06864B25E77E5901A174E44A66991FE88D9621D8B0)
等差数列各项都不是0,既an=/0,求前2n 1项奇数项和偶数项和的比
图片尺寸512x417![等差数列](https://imgs.wantubizhi.com/img/A1A61BAA66193547F3A6DD7D8EE527E996EFE48043F6EAEC7E5BFFDCC75C66D5D2029B970DC55FE5204E3B0EB042D2ED0F5DD1EFEC62891023CF8B8D0104E695384002D4E49961E1D0FC4DDB573C6DE0AE5212BB6A354612FFF151E813809DEF)
等差数列
图片尺寸600x450![等差数列前n项和练习题精选doc2页](https://imgs.wantubizhi.com/img/735A5D1F980B52A636CC46F12F2D1A7307DA612CD7BD3CD451EAC6A1EE9FEBC37BC225349C3184A9110245C056B6E526F068C7A47051B895ABFE30C94D5B2A3143B7B801135DED907B2BF834E131B2A2C42704E4D23421C8890FE49CC681D8A6)
等差数列前n项和练习题精选doc2页
图片尺寸793x1119![等差数列前n项和公式. 等比数列及其通项公式.等比数列前n项和公式.](https://imgs.wantubizhi.com/img/735A5D1F980B52A636CC46F12F2D1A730F432F10E5B65A788DAD6C0C6DC24D89D62A2F1D94D7AA550F49211CB9A309F264033083B16813633B7B7C1C659457FA065E2D02D719367F2E851F43CFB15EB33DF5CE4A8305AB137DD3680D88EBB315)
等差数列前n项和公式. 等比数列及其通项公式.等比数列前n项和公式.
图片尺寸645x431![已知单调递增的等比数列an满足:a2 a3 a4=28,且a3 2是a2,a4等差中项](https://imgs.wantubizhi.com/img/735A5D1F980B52A636CC46F12F2D1A73A94665B528626A563F9EE7F3D59A793CC0E7E7A232ABF7804FFB7CBEB03EAA58DFE5DA7DB73B473B471E6027C3C485D784CD40B6131680CFF1AA7092A34ED701E0E3A56610424D8C56E3044424A89833)
已知单调递增的等比数列an满足:a2 a3 a4=28,且a3 2是a2,a4等差中项
图片尺寸311x404