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1、数量关系易错题详细分析【例116,8,8,0,-32,()A.-128B.-96C.-64D.64选A多级数列分析：68820-80-32(-128)-32(-96)-24(-64)-6-16(_40)-2*3-4*4(-8*5)【例214,12,24,36,50,A.64B.72C.86D.98选B自然数列与合数数列的乘积【例315,2,17,10,(),26A.49B.30C.35D.37选D—组两个数字之间调换位置作差组成等差数列5210172637作差成等差数列【例4】1,9,35,91,189,
2、()A.361B.341C.321D.301选B多级等差数列193591189?826569815218304254【例51(10国)1,2,6,15,40,104,()A.329B.273C.225D.185选B多级数列，作差为前里两项相加的平方数1261540104?14925641691A22A23A25A28A213人2【例61(09国考)7,7,9,17,43,()A.117B.119C.121D.123选D2层多级数列作差的最后一级为前项与3的乘积7791743?02826802618542*
3、36*318*3【例71150,75,50,37.5,30,()A20B22.5C25D27.5选C做商多级数列做商后的分数呈规律变化150,75,50,37.5,30?1/22/33/44/55/6【例8]-1,2,1,8,19,()A.62B.65C.73D.86选A做和多级数列—1,2,1,8,19,9■19813A03A2S4【例9J(09省考B)1,1,3,4,7,()A,.7B.8c.9D.11选C113479■2471116作和成等差数列【例1013/15,1/3,3/7,1/2,()A.5
4、/8B.4/9C.15/27D.-3选C列式可变通为1/52/63/74/85/9(15/27)【例11】1/4,2/5,5/7,1,17/14,()D.26/19A.25/17B.26/17C.25/19选B分子1251017?作差后成等差数列分母4571014?作差后成等差数列【例12】(),11,9,9,8,7,7,5,6A.10B.llC.12D.13选C将数列分成三组？？11,99&775,6,??在将这三组数字分别组成2组:??,99,77,6?数字作差后成等差数列11,8,5,?成等差数列【
5、例13】105/6098/56,91/52,84/48,(),21/12A.77/42B.76/44C.62/36D.7/4选D将分数约成最简单形式【例14】1,16,27,16,5,()A.36B.25C.17/47/47/47/4?7/4D.14选C1A5,2A4,3A3,4A2,5Al,6A0?【例15】2,1,5,11,111,()A.1982B.1678C」111D.2443【例1613,7,16,107,A.1707B.1704C.1086D.1072选A3,7,16,107,?【例17】1,
6、2/3,5/9,(),7/15,4/9应该是选AA.1/2B.3/4C.2/13D.3/7【例1810,4,18,48,100,A.140B.160C.180D.200选C数列可以化为【例19】0,-1,(A.2B.3选A数列可以化为1*0,4*1,9*2,16*3,25*4,36*5),7,28C.4D.5(-1)八3+1,0a3-1,1a3+1,2a3-1,3a3+1【例201一1,9,8,(),25,42A.17B.UC.16D.19选A-1=8-98=?-88=25-??=42-25【例2113.
7、3,5.7,13.5,()A.7.7B.4.2C.11.4D.6.8【例22133.1,8&1,47.1,()A.29.3B.34.5C.16.1D.2&9【例231157,65,27,11,5,()A.4B.3C.2D」选D157=65*2+27,65=27*2+11,11=5*2+?【例2417,9,-1,5,()A.4B.2C.-lD.-3选D79-15?-210-6-2/210/2-6/2【例25167,54,46,35,29,()A」3B.15C.18D.2O选D6754463529?13811
8、694【例2612,6,13,24,41,()。A.68B.54C.47D.58选A2=1A2+2A(1-1)6=2A2+2A(2-1)13=3A2+2A(3-1)24=4A2+2A(4-1)41=5A2+2A(5-1)?=6A2+2A(6-1)=68衍生出一组新的有规律的数列:1,2,4,8,16,32【例27114,20,54,76,()A.104B.116C.126D.1443X3+5=145X5-5=207X7+5二5
