Each of the following numbers has two digits blotted out. Which of the numbers could be the number of hours in x days, where x is an integer? E.65■,■20
A.25■,■06 B.50■,■26 C.56■,■02 D.62■,■50
【参考答案】
E 解析:下面的每个数都被涂掉了两个数字。问下列哪一个是x(x是一个整数)天的小时数? 解:本题的正确答案是(E)。考生在解答该题时要注意应用整除的原则:一个数要想被另一个数整除,必须具有该数所具有的所有的质数因子。因为满足答案的数必须是x天的小时数,即24的倍数,24=2×2×2×...