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已知数列eqId2c1230a9ef5a4968be599681d676dd2b满足eqId032284ef281340a78dbf643944ff8cd4eqId6372bd95117149aaa8d7f28108af955d,则eqId7d72798e7026481ba06663159c28225f的值为(  )
A. 2                            B. -3                           C. eqIdfcc58431683b452ca65d1d9977a280bd                       D. eqIda8012d5322b240128851ebf3cd086e12
更新:2019/8/22难度系数:0.94题型:单选题组卷:17次
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
我国古代数学名著《算法统宗》中有如下问题:“远望巍巍塔七层,红光点点倍加增,共灯三百八十一,请问尖头几盏灯?”意思是:“一座7层塔共挂了381盏灯,且相邻两层中的下一层灯数是上一层灯数的2倍,则塔的顶层共有灯多少?”现有类似问题:一座5层塔共挂了363盏灯,且相邻两层中的下一层灯数是上一层灯数的3倍,则塔的底层共有灯
A. 81盏                      B. 112盏                     C. 162盏                     D. 243盏
更新:2019/8/22难度系数:0.85题型:单选题组卷:4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
等比数列eqId93e38ecd74a24cb59da79181b95bfd3aeqId9bb4e6b85555479fac38dd1322d33c52eqId490f4e163aef425499d5f2e022143ed9,则eqId82d7151c6dfc4c53badcd863a4615593__________.
更新:2019/8/22难度系数:0.94题型:填空题组卷:8次
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