请问陆旭老师,这个图片是网络明星课学生教材37页的第二个qx,我能排除abd,可以说一下c对比e吗?似乎我感觉e这么说可以和conclude that前面平行,但是不平行是不是更简洁,c有什么硬伤吗?之前网上资料说,逗号加连词之后要补出主语they,不过您上课说,这也不一定,还给了个反例,记得好像是after several years of rapid growth, the health care.....那个题e选项,所以我有点困惑
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?