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( Chú thích : Chuyện thường là A , Chuyện tham khảo là B)
Ta có : A= 2/5B
A+B=728
2/5B+B=728
7/5B= 728
B= 728: 7/5
B= 520
A= 728- 520 = 208
Vậy: Truyện thường = 208 quyển
Truyện tham khảo=520
Mong b chọn k cho mk
1. You are tired now, _________________? (are you/ do you/ aren’t you/ don’t you)
2. You haven’t seen Mary today, _________________? (do you/ did you/ are you/ have you)
3. There aren’t many people here, _________________? (is there/ are there/ isn’t there/ aren’t there)
4. Have you read this article _________________ the website? (in/ at/ on/ for)
5. You need a password to get _________________ to the computer system. (access/ information/ programs/ connection)
6. People use Internet for many purposes, _________________? (do they/ don’t they/ does it/ doesn’t it)
7. The internet has _________________ developed and become a part of our life. (increase/ increased/ increasing/ increasingly)
8. I am late for the meeting, _________________? (am I/ am not I/ aren’t I/ was I)
9. Let’s go to the cinema, _________________? (do we/ shall we/ shall not we/ will we)
10. Do me a favor, _________________? (can you/ can’t you/ couldn’t you/ do you)
noooooooooooooooooooooooooo
yes I am