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小学奥数题型与解题思路《计数模块》加乘原理及数字问题、排列组合

小学奥数题型与解题思路《计数模块》加乘原理及数字问题、排列组合

三、加乘原理及数字问题

9、爸爸、妈妈带小高去吃西餐.餐厅里有米饭和面条2种主食,烤牛排、烤羊排和烤鸡排3种主菜,奶油蘑菇汤1种汤,以及蛋糕和布丁2种甜点.如果小高想要点1种主食和1种主菜,汤和甜点可点可不点,而且种类不限.请问:小高一共有多少种点菜方法?

【解析】

小高可点的菜分成四种:主食,主菜,汤,甜点,这四种菜之间是搭配的关系.

第一步,挑选主食. 餐厅里有米饭和面条这2种主食,必须从中选择一种,有2种选择方法.

第二步,挑选主菜.餐厅里有3种主菜,必须从中选择一种,有3种选择方法.

第三步,挑选汤.汤类虽然只有1种,但是可以点也可以不点,点与不点这恰好是2种选择方法.

第四步,挑选甜点.甜点有2种,既可以两个都选,又可以只选其一,还可以两个都不选.那么甜点的选择有4种方法:蛋糕和布丁都点,二者都不点,只点蛋糕,只点布丁.

根据乘法原理,得小高一共有2*3*2*4=48种点菜方法.

10、从1,2,3,……,9,10中选出三个数,使得其中有且仅有两个数相邻,则不同的取法共有多少种?

【解析】

法一:1、2相邻,共7种;2、3相邻,共6种;3、4相邻,共6种;……8、9相邻,共6种;9、10相邻,共7种.综上所述,共56种.

法二:我们可以利用插空法和乘法原理,共有56种.

法三:我们也可以用排除法解决,从10个数中任意选3个数共有120种,其中任意两个数都不相邻的有56种,三个数都相邻的有8种.所以有且仅有两个数相邻的取法有120-56-8=56种.

11、一些数字问题:

(1)0、1、2、3、4可以组成__________个没有重复数字的三位数.

(2)1个0、1个1、2个2、2个3能组成_________个不同的六位数.

(3)0~6共七个数字,可以组成很多没有重复数字的四位数,3102是从小到大数的第_________个.

(4)1000~9999中含有数字5的自然数_________个.

【解析】

(1)利用乘法原理,首位数字不能为0,共有4*4*3=48个没有重复数字的三位数.

(2)因为首位数字不能为0,所以先排1个0,共有150个不同的六位数.

(3)千位数字分别是1和2时,都比3012小,这样的四位数共有240个.当千位数字是3,百位数字是0时,也比3102小,这样的四位数有20个.所以3102是从小到大的第240+20+1=261个数.

(4)利用排除法,不含数字5的四位数有8*9*9*9=5832个,所以含有数字5的自然数有9000-5832=3168个.

12、从1~20中选出两个数,和是5的倍数,一种多少种选法?

【解析】

1~20除以5的余数为0、1、2、3、4的各有4个,两数之和是5的倍数,这两个数除以5的余数有这三类情况:(1)余数都是0,6种;(2)一个余数是1,一个余数是4,16种;(3)一个余数 是2,一个余数是3,16种.所以总共6+6+16=38种.

13、从1~20中选出两个数,乘积是9的倍数,一共_______种选法.

【解析】

1~20中3的倍数有6个(其中9的倍数有2个),那么乘积是9的话,可以选一个9的倍数和一个非三的倍数28,或者两个3的倍数15,则总共28+15=43种.

14、银行ATM机取款时需要输入银行卡密码后才能进入下一步操作,密码是000000到999999中某一个六位数码.小勇取钱时忘记了密码,只记得密码中有1、3、5、7、9并且没有别的数字.如果不限制输错密码的次数,他至少输入__________次密码才能保证进入下一步.

【解析】

首先选出一个重复数字,共5种方法,然后排列,共有360种方法,共有5*360=1800种.

15、在所有的三位数中,能够被9整除,而且三个数字恰好能构成等差数列(可以改变顺序,如567、756)的共有__________个.

【解析】

三个数字的和为中间数的3倍,所以三个数的中间数只能是3或6或9,以数字3为中间数的数组为(0,3,6),(1,3,5),(2,3,4),(3,3,3),共能组成17个不同的三位数.同理,可算出中间数字是6、9的情况下分别有19个和1个符合要求的三位数,最终一共算得37个.

四、排列组合

17、用0、1、2、3、4这五个数字能组成__________个没有重复数字的四位偶数.

【解析】

四位偶数按照末位是0和不是0分为两类:

末位是0时,另位三位从四个数字中选择有24种;

末位是2或4时,千位有3种选择,百位和十位从余下三个数字中选择有6种,共2*3*6=36种.

综上所述,一共有24+36=60个没有重复数字的四位偶数

18、有甲、乙、丙、丁四人过河,河上有一条小船,每次只能坐两个人,这样每次就必须有一人把船划回来接剩下的人.那么四人过河有__________方式.

【解析】

先四人中选两人过,然后两人中一人回来;然后三人中选两人过,之后对岸三人中一人回来;最后两人过去.所以总共有108.

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  1. CONNECT:[ UseTime:0.001116s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.002075s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000843s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000731s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001649s ]
  6. SELECT * FROM `set` [ RunTime:0.000615s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001756s ]
  8. SELECT * FROM `article` WHERE `id` = 898397 LIMIT 1 [ RunTime:0.001075s ]
  9. UPDATE `article` SET `lasttime` = 1786171244 WHERE `id` = 898397 [ RunTime:0.007450s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000416s ]
  11. SELECT * FROM `article` WHERE `id` < 898397 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000625s ]
  12. SELECT * FROM `article` WHERE `id` > 898397 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000390s ]
  13. SELECT * FROM `article` WHERE `id` < 898397 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001019s ]
  14. SELECT * FROM `article` WHERE `id` < 898397 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000602s ]
  15. SELECT * FROM `article` WHERE `id` < 898397 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000893s ]
0.192077s