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4 tháng 9 2017

VIII/ chọn và sửa lỗi sai

1. Can you (A)sing a song? No, i (B)can't, but i (C)wish i (D)can -> could

2. The (A)weather was cold (B)because -> so we (C)had to cancel our (D)picnic

3. It (A)took us two (B)hours to (C)flight -> fly (D)to Hanoi

4. He (A)went (B)fishing (C)in -> on a (D)sunny morning

5. He (A)used (B)to go to bed (C)on -> at (D)midnight

6. She made so (A)much -> many mistakes (B)in this easy that her teacher (C)asked her

7. Nowadays (A)a lot of dangerous work (B)are -> is (C)carried out (D)by robots

8. It was (A)such a delicious (B)drink that i (C)have -> had to get (D)another glass

9. Either you (A)or he (B)are -> is (C)on duty (D)today

10. (A)there is (B)some -> a tree (C)at the entrance (D)to the village

4 tháng 9 2017

1. Can you (A)sing a song? No, i (B)can't, but i (C)wish i (D)can

->…could

2. The (A)weather was cold (B)because we (C)had to cancel our (D)picnic

->…so

3. It (A)took us two (B)hours to (C)flight (D)to Hanoi

->…fly

4. He (A)went (B)fishing (C)in a (D)sunny morning

->…on

5. He (A)used (B)to go to bed (C)on (D)midnight

->…at

6. She made so (A)much mistakes (B)in this easy that her teacher (C)asked her

->…many

7. Nowadays (A)a lot of dangerous work (B)are (C)carried out (D)by robots

->…is

8. It was (A)such a delicious (B)drink that i (C)have to get (D)another glass

->…such delicious

9. Either you (A)or he (B)are (C)on duty (D)today

->…is

10. (A)there is (B)some trees (C)at the entrance (D)to the village

->…there are

Tìm lỗi sai và sửa lại giúp mình .Mình cảm ơn ạ.                                                            8. It is very difficult for me crossing the rive at night.     A                          B            C                         D9. Lan can run the fastest than her friends.             A              B                 C         D10. Nam is the taller boy in this school.        A            B             C                D11. Because of An's English was poor,...
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Tìm lỗi sai và sửa lại giúp mình .Mình cảm ơn ạ.                                                            8. It is very difficult for me crossing the rive at night.
     A                          B            C                         D
9. Lan can run the fastest than her friends.
             A              B                 C         D
10. Nam is the taller boy in this school.
        A            B             C                D
11. Because of An's English was poor, she couldn't pass the final exam
        A                                      B                     C                        D 
12.Our classroom doesn't have any windows. I wish our classroom has some windows
                                A                 B                                                      C                 D
13. Jom asked me did I like his new motorbike.
                 A     B      C                             D
14. He has learned a lot in the last couple of years, didn't he?

                    A                B                 C                          D
15. They don't stay at the park very long last sunday.
       A       B                    C                             D 
16. We usually go to our home village at least once a week on summer.
              A                                            B           C                 D

1
16 tháng 11 2021

8. It is very difficult for me crossing => to cross the rive at night.
     A                          B            C                         D
9. Lan can run the fastest=> faster than her friends.
             A              B                 C         D
10. Nam is the taller => tallest boy in this school.
        A            B             C                D
11. Because of => because An's English was poor, she couldn't pass the final exam
        A                                      B                     C                        D 
12.Our classroom doesn't have any windows. I wish our classroom has => had some windows
                                A                 B                                                      C                 D
13. Jom asked me did I like=> if I liked his new motorbike.
                 A     B      C                             D
14. He has learned a lot in the last couple of years, didn't => hasn't he?

                    A                B                 C                          D
15. They don't => didn't stay at the park very long last sunday.
       A       B                    C                             D 
16. We usually go to our home village at least once a week on => in summer.
              A                                            B           C                 D

PTHH: \(Al_2O_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2O\)

Ta có: \(\left\{{}\begin{matrix}m_{H_2SO_4}=588\cdot5\%=29,4\left(g\right)\Rightarrow n_{H_2SO_4}=\dfrac{29,4}{98}=0,3\left(mol\right)\\n_{Al_2O_3}=\dfrac{20,4}{102}=0,2\left(mol\right)\end{matrix}\right.\)

Xét tỉ lệ: \(\dfrac{0,2}{1}>\dfrac{0,3}{3}\) \(\Rightarrow\) Al2O3 còn dư

\(\Rightarrow n_{Al_2\left(SO_4\right)_3}=0,1\left(mol\right)=n_{Al_2O_3\left(dư\right)}\)

\(\Rightarrow C\%_{Al_2\left(SO_4\right)_3}=\dfrac{0,1\cdot342}{20,4+588-0,1\cdot102}\cdot100\%\approx5,72\%\)

21 tháng 10 2021

\(d,ĐK:x\ge1\\ PT\Leftrightarrow\sqrt{x-1}=2+\sqrt{x+1}\\ \Leftrightarrow x-1=2+x+1+4\sqrt{x+1}\\ \Leftrightarrow4\sqrt{x+1}=-4\Leftrightarrow x\in\varnothing\left(4\sqrt{x+1}\ge0\right)\\ g,ĐK:x\ge\dfrac{1}{2}\\ PT\Leftrightarrow x+\sqrt{2x-1}+x-\sqrt{2x-1}+2\sqrt{\left(x+\sqrt{2x-1}\right)\left(x-\sqrt{2x-1}\right)}=2\\ \Leftrightarrow2x+2\sqrt{x^2-2x+1}=2\\ \Leftrightarrow\sqrt{\left(x-1\right)^2}=\dfrac{2-2x}{2}=1-x\\ \Leftrightarrow\left|x-1\right|=1-x\\ \Leftrightarrow\left[{}\begin{matrix}x-1=1-x\left(x\ge1\right)\\x-1=x-1\left(x< 1\right)\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=1\left(tm\right)\\x\in R\end{matrix}\right.\)

 

16 tháng 2 2022

7.Therefore -> However

8. a -> bỏ a

9. annoying at -> annoyed at

29 tháng 3 2022

Câu 1. Tình yêu của Trang ko được gọi là mãnh liệt, mà chỉ có thể gọi là tình yêu tuổi học trò thôi. Vì để gọi là tình yêu đích thực thì phải cần có thời gian để tìm hiểu đối phương, có khi phải mất 10 năm để đến một mối quan hệ. Bạn Trang ko nên nghĩ về việc tự vẫn, vì chuyện đó ko đáng. Tuổi của bạn vẫn nên chú tâm vào việc học thay vì yêu đương.

29 tháng 3 2022

Cả 2 ???