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12 tháng 1 2022

ói dòi ơi

31 tháng 1 2023

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12 This matter to which you should pay attention is of great importance

13 The woman to whom you gave place on the bus lives next door to me

31 tháng 1 2023

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1->13 mình làm ở đây nhé

https://hoc24.vn/cau-hoi/giup-to-vss-a.7543535789690

7 tháng 11 2021

0 sights

1 awesome

2 enthusiastic

3 achievement

4 competitor

5 unstable

6 steadily

7 boring

8 strengthen

9 additional

10 likelihood

7 tháng 11 2021

e cảm ơn ạ:)))))

23 tháng 12 2021

\(2Mg+O_2\xrightarrow{t^o}2MgO\\ Mg+2HCl\to MgCl_2+H_2\\ MgCl_2+2NaOH\to Mg(OH)_2+2NaCl\)

Do đó: \(\begin{cases} X,Z:Mg\\ Y:MgO\\ T:MgCl_2\\ U:H_2\\ F:NaCl\\ V:Mg(OH)_2 \end{cases}\)

Ta có:

\(n_{Mg}=\dfrac{a}{24}\Rightarrow n_{MgO}=\dfrac{a}{48}\\ \Rightarrow m_1=m_{MgO}=\dfrac{a}{48}.40=\dfrac{5a}{6}\\ n_{MgCl_2}=\dfrac{a}{48}\Rightarrow n_{Mg(OH)_2}=\dfrac{a}{48}\\ \Rightarrow m_2=m_{Mg(OH)_2}=\dfrac{a}{48}.58=\dfrac{29a}{24}\\ \Rightarrow \dfrac{m_1}{m_2}=\dfrac{5}{6}:\dfrac{29}{24}=\dfrac{20}{29}\)

23 tháng 12 2021

 

 

25 tháng 3 2021

1 Life in the country is not as good as life in the city

2 These room are cleaned every evening

3 Would you mind decorating the christmas tree

4 It's the first time I have talked to the headmaster

V

1 have ever met

2 worked

3 reading

4 are looking - seeing

5 was

VI

1A

2A

3D

4D

5B

25 tháng 3 2021

IV/

1. is not as good as life in the city

2. are cleaned every evening

3. decorating the Christmas tree?

4. the first time I have (ever) talked to the headmaster

V/

1. have ever met

2. worked

3. reading

4. are looking - seeing

5. was

VI/

1a 2a 3d 4d 5b