数量关系专练及详解.

数量关系专练及详解.
数量关系专练及详解.

学而优则仕,仕出京佳 京佳公务员考试培训学院 https://www.360docs.net/doc/7e10820881.html,

数量关系专练及详解

数字推理

26. 0,3,9,21,( ),93

A. 40

B. 45

C. 36

D. 38

27. -3,3,0,( ),3,6

A. 3

B. 4

C. 5

D. 6

28. 44,54,65,77,( )

A. 91

B. 90

C. 89

D. 88

29. 12,10,14,13,16,16,( ),( )

A. 14,18

B. 20,19

C. 18,19

D. 15,18

30. 13,9,11,6,9,3,( ),( )

A. 6,0

B. -1,1

C. 7,0

D. 7,6

31. 25,37,410,614,820,1228

,( ) A. 22456 B. 1432 C. 2048 D. 1640

32. 3,6,8,13,20,( ),51

A. 31

B. 28

C. 42

D. 32

33. 22,122,1221,11221,112211,( )

A. 111221

B. 111122

C. 1122111

D. 1112211

34. 7,4,14,8,21,16,( ),( )

A. 20,18

B. 28,32

C. 20,32

D. 28,64

35. 160,80,40,20,( )

A. 1/5

B. 1

C. 10

D. 5

数学运算

36. 把一根钢管锯成两段要用4分钟,若将它锯成8段需要多少分钟?( )

A. 16

B. 32

C. 14

D. 28

37. 一个四边形广场,它的四边长分别是60米、72米、84米和96米,现在要在四边上

树,四角需种树,而且每两棵树的间隔相等,那么至少要种多少棵树?( )

A. 22

B. 25

C. 26

D. 30

38. 甲、乙二人同时同地绕400米的环形跑道同向而行,甲每秒跑8米,乙每秒跑9米,

多少秒后甲、乙第3次相遇?( )

A. 400

B. 800

C. 1200

D. 1600

39. 一个等腰三角形,两边长分别为5cm ,2cm ,则周长为多少厘米?( )

A. 12

B. 9

C. 12或者9

D. 无法确定

40. 电影票10元一张,降价后观众增加了一倍,收入增加了1/5。则一张票降价多少

元?( )

一个人学习的量与成长的速度成正比——京佳格言

A. 8

B. 6

C. 4

D. 2

41. 在浓度为40%的酒精中加入4千克水,浓度变为30%,再加入m千克纯酒精,浓度

为50%,则m为多少千克?()

A. 8

B. 12

C. 4.6

D. 6.4

42. 一架飞机所带燃料,最多可用6小时。出发时顺风,每小时飞1500千米,飞回时逆

风,每小时飞1200千米,此飞机最多飞出多少小时就需往回飞?()

A. 8/3

B. 11/3

C. 3

D. 5/3

43. 学生在操场上列队做操,只知人数在90—110之间。如果排成3排则不多不少;排

5排则少2人;排成7排则少4人;则学生人数是多少人?()

A. 102

B. 98

C. 104

D. 108

44. 一个长方体模型,所有棱长之和为72,长宽高的比是4:3:2。则体积是多少?

()

A. 72

B. 192

C. 128

D. 96

45. 某次考试中,小林的准考证号码是个三位数,个位数字是十位数字的2倍,十位数

字是百位数字的4倍,三个数字的和是13,则准考证号码是()。

A. 148

B. 418

C. 841

D. 814

答案及解析

26. B 做差之后得:3,6,12,(24),(48),新数列是一个等比数列。(或:

各项除以3得:0,1,3,7,15,31,此数列为二级等差数列变式。)

27. A 和数列,数列的第一项加上第二项,等于第三项。

28. B 后项与前项的差为:10,11,12,13。

29. A 奇偶数列。

30. C 奇偶数列。

31. D 分数数列。前项分母与分子的差等于后项分数的分子;和等于后项分数的分母。

(或:奇偶数列,奇数项为2

5

,偶数项为

3

7

。)

32. D 和数列,第一项与第二项的和,再减去1,等于第三项。

33. D 纯数字数列,22的前后交替添加1。

34. B 奇偶数列。

35. C 等比数列,前项是后项的2倍。

36. D 4×7=28。

37. C 此题的关键点是“四角需种树”,首先求出60、72、84、96的最大公约数为

12,然后就是环形植树问题了,(60+72+84+96)÷12=26。

昨晚多几分钟的准备,今天少几小时的麻烦——京佳格言

38. C 追及问题,根据“追及时间=追及路程÷速度差”,要想第三次追上,那么

需要多跑1200米,所以1200÷(9-8)=1200秒。

39. A 根据“三角形两边之和大于第三边,两边之差小于第三边”可知,另外一条

边只能是5cm 。

40. C 设原人数为x 人,降价后的票价为y 元,则有:

(2xy )÷(10x )=6/5,得出:y =6,所以一张票降了4元。

41. D 浓度问题。设原溶液的质量为x 千克,则可列如下方程:

0.4x x +4=30%,0.4x +m x +4+m

=50%,所以m =6.4。 42. A 设去和来的时间分别是x 、y 小时,则有:

1500x =1200y ,即x :y =4:5,又因为x 、y 的和为6,可得出x =8/3小时。

43. D 总人数能被3整除,除以5余3,除以7余3。

44. B 几何问题。长方体共有4条长、4条宽、4条高,则72÷4=18,即长宽高的和

为18,再根据“长宽高的比是4:3:2”,可知长宽高分别是8、6、4,所以体积为192。

45. A 直接代入法。

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