cho 200ml dung dịch Na(OH) 1M tác dụng với 294g H2SO4 5%, D=1,5 g/m. Xác định Cm

cho câu chủ đề:" Nhân vật chị Dậu trong đoạn trích tức nước vỡ bờ là một người phụ nữ lao động nhưng yêu thương chồng con và có một tinh thần phản kháng". trình bày theo cách quy nạp

là poverty nha

A=(x-5)x (x² +5x+25)-x(x²+3)

19 It's three years since I last saw Nam        

🡪 I haven't ...........................………........

20 The last time she visited me was five months ago.    

🡪 She hasn’t ....................………....

21 I last wrote to my uncle in July.        

🡪 I haven't ...................………........

22 It's a long time since we became close friends.        

🡪 We have...................……

23 Minh last wrote to his pen pal five months ago.    

🡪 Minh hasn’t ................…………

24 He hasn’t chatted with his classmates through the internet for ages.

🡪 It's ages.........……………

25 We haven't seen her since we left university.    

🡪 The last time.......................…………………

26 It started to rain at two o`clock    

=>It has...........................................……………...

27 they have leant English for ten years.    

🡪 They started.........................……………………………………………………

28 I haven't written to you for a month.    

🡪 I last ....................................……………………………………………………

1 It is two years since I last met her

I haven’t ……………………………………………………………….

It is ages since I last spoke to her

I haven’t………………………………………………

3. I last did   my homework last week

I haven’t…………………………………….

4. They last bought new clothes a long time ago

They haven’t ……………………………………………………………..

5.It is the first time I have seen this film

I have never………………………………………………………….

6.It is the most expensive hotel I have stayed

I have never…………………………………………………………

7.This is the best computer I have had

I have never…………………………………………………………………..

8This is the first time I have eaten thi food

I have never…………………………………………………….

9I have never met this kind of person before

It is the first…………………………………………………………….

10.I have never read this book before

It is the first…………………………………………………………………………..

11  She has never used the telephone before

It is the first ……………………………………………………………..

12.We have never read a romantic story before

It is the first time………………………………………………………..

13.I started learning English two years ago

I have…………………………………………………………………………….

\14.I began living here in 2006

I have …………………………………………………………………….

15.I started teaching English in 2003

I have ………………………………………………………………….

Write the correct form of the verb 
1. Neither of the films(be) worth seeing 
2. Each of Dicken's characters (be) carefully delineated
 3. Every one of Lan's novels (have) some violence in it 
4. Not only a dog but also two cats (be) at home in his garage
 5. Not only two doves but also a bobwhite(be) in the aviary. 
6. Either a dollar or two box tops (be) required for admission
7. Either two box tops or a dollar (be) required for admission ]
8. one of you (be) to be appointed chairperson
 9. both a poem and a short story (have) been written by a young author 
10. I am the one who (stay) ahead of the rest 
11. I am one of those people who (stay) ahead of the rest
12. Neither of the men (be) sure about his duties 
13. Neither animals nor their keeper (be) prepared for the storm
 14. each of them (have) peculiar powers 
15. neither of them(do) real magic 
16. neither of his method (work) 
17. the Chinese (be) famous for their food 
18. Physics (be) my favourite subject 
19. swimming (be) my favourite sport 
20. ten dollars (be) a high price for a theatre ticket

b=4-2xy+12y-x^2+10y^2-2x

giúp mik vs ạ