请问一下老师,关于这道题,我是根据 either ..or..绝对的平行做对的,但是在and并列的两个谓语 date 和 were fashioned的这个部分有点困惑。为什么不是date and are fashioned 或者说 dated and were fashioned。我认为这里是在讲述一个客观事实:这个神像可以追朔到什么时期和由什么制成,应该是用一般现在时。were fashioed 是过去式的被动语态对吧?date and were fashioned感觉也不复合并列的要求。
题目:A Printer numbered consecutively the pages of a book, beginning with 1 on the first page. In numbering the pages, he printed a total of 189 digits. How many pages are there in the book?
问题:看了中文翻译并听了管老师的讲解,我都没弄明白这个题目的解题思路。的别是对“a total of 189 digits”的处理。
题目:If n is a prime number greater than 3, what is the remainder when n的平方is divided by 12?
问题:当管老师解题时,他出了3个方程式,分别是:
1) n=3A+1, n的平方=9A(square)+6A+1
2) n=3A+2, n的平方=9A(square)+12A+4
3) n=2A+1, n的平方=4A(square)+4A+1
我不明白的点是:这3个方程式是怎么推到或者是一看到题目就这么设出来的?