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2017年小升初英语奥数题练习(4)

[05-11 21:04:25]   来源:http://www.jdxx5.com  小学趣味数学   阅读:92823

概要:ot a valid number in the octal number system (base 8)?A) 128 B) 127 C) 126 D) 125 E) 1242、The number of diagonals that can be drawn in a regular polygon withtwenty sides (icosagon) is_____.3、If a and b are integers, 10 3=1,152 7=3, and then 379 6 is equal to_____.4、Two numbers are in the ratio 2 : 3. When 4 is added to each number the ratio changes to 5 : 7.The sum of the two original numbers is____.5、The greatest number of Mondays which can occur in 45 consecutive days is____6、Saul plays a video game in which he scores 4 f

2017年小升初英语奥数题练习(4),http://www.jdxx5.com

  1、Did you know? In the decimal number system (base 10) ten different digits, 0 to 9, are used to write all the numbers. In the binary number system (base 2) two different digits are used, i.e. 0 and 1.

  Which one of the following numbers is not a valid number in the octal number system (base 8)?

  A) 128    B) 127   C) 126   D) 125   E) 124

  2、The number of diagonals that can be drawn in a regular polygon with

  twenty sides (icosagon) is_____.

  3、If a and b are integers, 10 3=1,152 7=3, and then 379 6 is equal to_____.

  4、Two numbers are in the ratio 2 : 3. When 4 is added to each number the ratio changes to 5 : 7.The sum of the two original numbers is____.

  5、The greatest number of Mondays which can occur in 45 consecutive days is____

  6、Saul plays a video game in which he scores 4 for a hit and lost 6 for a miss. After 20 rounds his score is 30. The number of times he has missed is____.

  7、Three girls A, B and C run in a 100 m race. When A finishes, B is 10 m behind A and when B finishes C is 20 m behind B. How far in metres was C from A when A finished?(Let’s assume all the athletes run at a constant speed)

  8、The areas of the faces of a rectangulabox are 84 cm2 , 70 cm2and 30 cm2.The volume of the box in cm3 is____.

  9、You have 3 weights: 1 kg, 3 kg and 9 kg as well as an equal arm balance, as shown. How many different weight objects can you weigh with these three?

  [Remember the weights may be placed on either side]

  参考答案:

  1、A 考察我们学过的简单的进制问题,显然8进制中没有8出现

  2、170 找规律,公式为n×(n-3)÷2

  3、1 定义新运算,就是求379÷6的余数。

  4、40,16和24

  5、7

  6、5

  7、28米,根据距离比求出速度比,三者的速度比为1:9/10:18/25

  8、420 分解质因数

  9、13种


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