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5与11的等差中项是(   )
A.eqIdecb828cf922546bb9760e0ce5c95a9cbB.eqId401586f7a7f248b7904a4cfeaa2ed2f0C.eqId16fc2c4ac7e940cdad49c4a01d735579D.eqId11f75c152f5341f39d020095cecda9b3
eqId06d9f08c07ba43a58f637798d6e65053eqIdb48365b71151440d9579dbdeae6e74d8的等差中项是____________.
在等差数列{an}中,已知a4+a8=16,则该数列前11项和S11=()
A.58B.88C.143D.176
更新:2020/09/14 |题型:单选题 |组卷:5072|引用[19]
难度: 0.94 | 2020·四川高一期末
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已知等差数列eqId93e38ecd74a24cb59da79181b95bfd3a中,eqIdccc85e6897c74e6fafcf460bf045c4ec,公差eqId985b862fc476485199f7c3477620155e,则eqId0509add794484602a2c710f41d9ddddceqIdca19c700219248bdb9970e80e029af74的等差中项是(   )
A.eqId52ef9cda12e5410dafc3bfcf1840555bB.eqId757fa3a8e0bc4df9bd2f30045051a231C.eqIdcfc0e432d40c48a4baab54d44124935eD.eqIddd4bf187d3fd47f6bcc24e568e09643e
1和4的等差中项是____________;4和_____________的等比中项是eqId6a802b6dfc63409ea3b8e335120efdba.
在等差数列eqId93e38ecd74a24cb59da79181b95bfd3a中,eqIdbac23d95cb114ad78dd22a804f850301eqId47098e0e18744c928563324ffc6f1903,则eqId9d51ad182bd541949184738b462bbab8(   )
A.eqIddd4bf187d3fd47f6bcc24e568e09643eB.eqIdecb828cf922546bb9760e0ce5c95a9cbC.eqId5557c7b84f794778b10717993bbb709eD.eqId76cab3deb22044968094187ee9174798
已知数列eqId13029b97b0f044caa9e83fadc7e3940c是等差数列,则实数eqId70a27b6ddf6b478285353abb3b1f3741的值为(   )
A.eqIdc052ddfbd4524f67a79e0e77c2e5656aB.eqId8898c1dc81824f3098bbeae74e8f11fdC.eqIdddd35c5d043e4ebeac32a99367053c68D.eqIdcd9b24a6a6e5426ab775be20461174e3