4(2x ²+1)+3(x ²-2x) √2x-1=2(x ³+5x)

Ta có: 

PT: 

Xét tỉ lệ: , ta được Fe dư.

a, Theo PT: 

⇒ V_H2 = 0,05.22,4 = 1,12 (l)

mk sửa lại là câu ghép nha

nhân hóa

11 joined - was

12 has painted

13 discovered

14 have studied - haven't learnt

15 Have - taught - have - taught - started - have taught

16 saw - haven't seen

17 Have - ever won - won

18 has worked

19 haven't lived

20 was - wanted

IV. Rewrite the following sentences using questions word+ to infinitives

1. We don't know where we should put the sofa

-> We don't know where to put the sofa.

2the rules didn't specify who i should speak to in case of an emergency

-> The rules didn't specify who to speak to in case of an emergency.

3mai wondered họ she could ride tthe scooter

-> Mai wondered how to ride the scooter.

4 let us decide whẹn we should start the project

-> Let us decide when to start the project.

5 could you tell me where i can find a good hotel

-> Could you tell me where to find a good hotel?

6 we must find out what we are to do next

-> We must find out what to do next.

7 a good dictionary tells you how you should pronounce the words

-> A good dictionary tells you how to pronounce the words.

8we are not sure who we will meet at the entrance

-> We are not sure who to meet at the entrance.

9 i can't remember when I have to turn off the oven

-> I can't remember when to turn off the oven.

10 do you know what you should look fo

-> Do you know what to look for?

V turn the following statements into reported speech

1 "I'll help my mum cook dinner tonight" ,said hoa

-> Hoa said she would help her mum cook dinner that night.

4 "my best Friend hasn't called me for one week" said nam

-> Nam said his best friend hadn't called him for one week.

5 "are you at the sports center now" lucia's mother Alex her

-> Lucia's mother asked her if she was at the sports center then.

8 we spoke to your parents yesterday" said Mr Quang to trung

-> Mr Quang told Trung that they spoke to his parents the day before.

Ix finish eacn of the following sentences in such a way that it is as similar as possible in meaning to the original sentence use the word given and other words as nếcnecess do not change the form of the given words

1"what do you think about teenagers whọ dye their hair?" Thought

-> What is thought about teenagers who dye their hair?

2 it was quite surprising for us that he passed the exam . Surprised

-> We were quite surprised that he passed the exam.

Trích mẫu thử

Cho quỳ tím vào các mẫu thử

Quỳ tím hóa đỏ=>H2SO4

Quỳ tím hóa xanh=>NaOH

Quỳ tím không đổi màu=> H2O và NaCl(*)

Cho AgNO3 vào (*)

Tạo kết tủa trắng=>NaCl

pt: NaCl+AgNO3--->AgCl+NaNO3

2:please tell me the price of this shirt and i will look at it later =>I'd like.....

3:We passed an anxious hour =>We passed an hour.....

4:It was such a surprise for her aunt to see mary that she burst into tears =>Mary's aunt was so.....

5:Despite what i said last night,i still loved you =>Although.....

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