题目

英语翻译
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
3、The number of diagonals that can be drawn in a regular polygon with
twenty sides (icosagon) is_____.
4、If a and b are integers,10Ä3=1,152Ä7=3,and then 379Ä6 is equal to_____.
5、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____.
6、The greatest number of Mondays which can occur in 45 consecutive
days is____
7、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____.
8、Three girls A,B and C run in a 100 m race.When A finis

提问时间：2020-07-27

答案

1,十进制用0～9表示所有数,二进制只用0和1表示下面哪个数在八进制下是非法的?A)128（八进制用0～7）3,一个二十边形内可画出多少条对角线?170条（20选2,减去20条边）4,如果a和b都是整数,10Ä3=1,152Ä7=3,那...