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从1,2,3,4,5五个数中任取3个,可组成不同的等差数列的个数为( )
A. 2                            B. 4                             C. 6                             D. 8
更新:2019/8/22难度系数:0.94题型:单选题组卷:2次
设等差数列eqId93e38ecd74a24cb59da79181b95bfd3a中,eqId276a3097238d40c8afa92cc5b4ce5ad9.
(1)求数列eqId93e38ecd74a24cb59da79181b95bfd3a的通项公式;
(2)若等比数列eqIdeeb4ca98872f4e6d91cea28f43fc0b63满足eqId732e3c4c88c449b2893ce46b72bd3f21,求数列eqIdeeb4ca98872f4e6d91cea28f43fc0b63的前eqIdf458db68122849abb588feb2e682d9ac项和eqIddb5481de79c946c0a760143297d5eade.
更新:2019/8/22难度系数:0.65题型:解答题组卷:22次
已知递增等比数列eqId93e38ecd74a24cb59da79181b95bfd3aeqIdb18f50f6d0d84cfa8108f83ad4c0767beqIdf4908784d198499988beee273e5f4fee,另一数列eqIdeeb4ca98872f4e6d91cea28f43fc0b63其前eqIdf458db68122849abb588feb2e682d9ac项和eqIdce257bad7cb447d781207e9c8190e847.
(1)求eqId93e38ecd74a24cb59da79181b95bfd3aeqIdeeb4ca98872f4e6d91cea28f43fc0b63通项公式;
(2)设eqId6300a02cb0914646a930e9f417e396ca其前eqIdf458db68122849abb588feb2e682d9ac项和为eqId92ed363a54bd4a8a93df9463bb3af1f5,求eqId92ed363a54bd4a8a93df9463bb3af1f5.
更新:2019/8/22难度系数:0.65题型:解答题组卷:39次
等差数列eqId93e38ecd74a24cb59da79181b95bfd3a中,eqId1e4db17701f444dfa453bbe67d5cd550eqId9cfea2d311da45488a84ad01481210f8.
(1)求eqId93e38ecd74a24cb59da79181b95bfd3a的通项公式;
(2)求eqId65f736bf9e7441f8baaad09ec0a95165的前n项和eqIddb5481de79c946c0a760143297d5eade.
更新:2019/8/22难度系数:0.85题型:解答题组卷:21次
已知数列为 eqId0f238dcb225d4a43b18c9123a9dd44d7;其前n项和为_____________.
更新:2019/8/22难度系数:0.65题型:填空题组卷:9次
有四个数,其中前三个数成等差数列,后三个数成等比数列,前三个数的和为eqId5557c7b84f794778b10717993bbb709e,后三个数的和为eqId9c25abbea2da4c519a0de14dbfad2a44,则这四个数分别为______________________.
更新:2019/8/22难度系数:0.65题型:填空题组卷:11次
已知等差数列eqId93e38ecd74a24cb59da79181b95bfd3aeqIdeeb4ca98872f4e6d91cea28f43fc0b63,其前eqIdf458db68122849abb588feb2e682d9ac项和分别为eqIddb5481de79c946c0a760143297d5eadeeqId92ed363a54bd4a8a93df9463bb3af1f5eqId7c97abce77ae48b69032bc25e879fbe3,则eqId45230d299114408a86ea46de20b0b47f( )
A. eqId8dce69c561f442e39f3d8cd1eca9ad10                        B. eqId0ad3a18377e74214b11cb41269f7a704                        C. eqIdf1bd69290a464f71ac73b93c51985105                           D. eqIdc052ddfbd4524f67a79e0e77c2e5656a
更新:2019/8/22难度系数:0.65题型:单选题组卷:35次
已知数列eqIdf1bd69290a464f71ac73b93c51985105eqId75691f28a5bb4c8287401017aa3a2d29eqId0509add794484602a2c710f41d9ddddceqId5cae532f2168495188622189ec8df62ceqId16fc2c4ac7e940cdad49c4a01d735579成等差数列,eqIdf1bd69290a464f71ac73b93c51985105eqId91527d9f559f45afb12460e0c2e33b6feqId802dd8e915624120aa727fb9b14978b0eqId366cae234e024c18a9452147867e83c8eqId16fc2c4ac7e940cdad49c4a01d735579成等比数列,则eqId228901f77e574bf4a52a4cc8ca3f5d62(   )
A. eqIdf1bd69290a464f71ac73b93c51985105                           B. eqId7f4cbc932b504200bd85e1dbb4d96181                          C. eqId08c6d6e29d1b4f268313bd843be2cf81                       D. eqId1582204f888f450b9781f22d23d23e89
更新:2019/8/22难度系数:0.65题型:单选题组卷:12次
若三角形的三个内角成等差数列,则第二大的角度数为(  )
A. eqId26f1d01cdbbc4f73909a617af5e3e6a2度                     B. eqIdc15d343cecf74172a34fccfff78c1cd7度                     C. eqId8e18403e6c404cde904eb0b42cde0446度                     D. eqIdc315857dab4a49a8a20fb0653fea3b06
更新:2019/8/22难度系数:0.85题型:单选题组卷:8次
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