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1、数量关系易错题详细分析【例1]6,8,8,0,一32,()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2】4,12,24,36,50,()A.64B.72C.86D.98选B自然数列与合数数列的乘积【例3]5,2,17,10,(),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,()A.361B.341C.32
2、1D.301选B多级等差数列193591189?826569815218304254【例5】(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?14925641691A22A23A25A28A213A2【例6】(09国考)7,7,9,17,43,()A.117B.119C.121D.123选D2层多级数列作羌的最后一级为前项与3的乘积7791743?02826802618542*36*318*3【例7]150,75,50,37.5,30,()A20
3、B22.5C25D27.5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•19813A03A23A4【例9](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10】3/15,1/3,3/7,1/2,()A.5/8B.4/9C.15/27D.-3选C列式可变通为1/52/63/74/85/9(15/27)【例11】
4、1/4,2/5,5/7,1,17/14,()A.25/17B.26/17C.25/19D.26/19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.1OB.llC.12D.13选C将数列分成三组？？11,998,775,6,??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【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
5、单形式7/47/47/47/4?7/4【例14】1,16,27,16,5,()A.36B.25C」D」4选C1人5,2人4,3A3,4A2,5Al,6A0?【例15]2,1,5,11,111,()A.1982B.1678C.1111D.2443【例16】3,7,16,107,A.1707B.17040.1086D.1072选A3,7,16,107,?【例17]1,2/3,5/9,(),7/15,4/9应该是选AA.1/2B.3/4C.2/130.3/7【例18】0,4,18,48,100,()A.140B.160C.180D.200选c数列可
6、以化为1*0,4*1,9*2,16*3,25*4,36*5【例19】0,-1,(A.2B.3选A数列可以化为),7,28C.4D.5(-1)人3+1,0A3-l,lA3+l,2A3-1,3人3+1【例20】一1,9,8,(A.17B.11),25,42C.16D.19选A-1二8-98二？-88二25-??=42-25【例21]3.3,5.7,13.5,()A.7.7B.4.2C.11.4D.6.8【例22]33.1,88.1,47.1,()A.29.3B.34.5C.16.1D.2&9【例23】157,65,27,11,5,()A.4B.3
7、C.2D」选D157=65*2+27,65=27*2+11,11=5*2+?【例24】7,9,-I,5,()A.4B.2C.-lD.-3选D79・15?-210・6-2/210/2-6/2【例25]67,54,46,35,29,(A.13B.15C」8D.20选D6754463529?13811694【例26】2,6,13,24,41,()。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
8、衍生出一组新的有规律的数列：1,2,4,8,16,32【例27]14,20,54,76,()A.104B.116C.126D.1443X3+5=145X5-5=20
