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Nguyễn Minh Đạt
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Đỗ Tuệ Lâm
27 tháng 2 2022 lúc 13:54

2. She didn't buy the house because of.

3, She only accepted the job because it brought high salary .

4, We couldn't sleep because of the hot weather .

5, Because the World War II happened, women took over business for their absent husbands .

6, We didn't go fishing because of the rough sea .

7, She was very angry because of his bad behavior .

8, He couldn't sleep because he worried .

9, Because he drove too fast, he caused a serious accident .

Nguyễn minh Đạt
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Shauna
5 tháng 10 2021 lúc 18:11

Câu 36 C

Câu 37 C

Câu 38 C

Nguyễn Minh Đạt
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htfziang
18 tháng 10 2021 lúc 8:18

11. Have you ever been 

12. haven't done

13. have you seen - has already done

14. have just decided

15. has been

16. hasn't had

17. hasn't played

18. haven't had

19. haven't seen

20. have just realized

Đây là thì HTHT nhé, cấu trúc rất dễ nhớ thôi nè :3 

      S+ have/has + Vp2 (nói về một việc đã bắt đầu trong quá khứ và vẫn tiếp diễn đến bh)

Dấu hiệu nhận biết: for + một khoảng thời gian, since + một thời gian cụ thể trong quá khứ

vd: She hasn't played badminton for 2 years.

 He hasn't gone to school since 3 weeks ago.

Nguyễn minh Đạt
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Shauna
5 tháng 10 2021 lúc 18:16

Câu 53: C
Câu 55 C

Câu 56 C

Câu 59C

Nguyễn Minh Đạt
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Đỗ Thanh Hải
7 tháng 10 2021 lúc 20:46

1 A

2 B

3 A

4 C

D

1 C

2 D

3 A

4 D

5 B

7 D

8 B

9 C

10 C

E

1 C

2 C

3 A

4 B

5 D

Nguyễn Minh Đạt
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Edogawa Conan
30 tháng 9 2021 lúc 11:42

Bài 1:

\(n_{CuO}=\dfrac{56}{80}=0,7\left(mol\right)\)

PTHH: CuO + 2HCl → CuCl2 + H2O

Mol:      0,7       1,4

\(m_{ddHCl}=\dfrac{1,4.36,5.100}{14,6}=350\left(g\right)\)

Bài 2:

\(n_{Na_2SO_3}=\dfrac{12,6}{126}=0,1\left(mol\right)\)

PTHH: Na2SO3 + 2HCl → 2NaCl + SO2 + H2O

Mol:         0,1                                      0,1

\(V_{SO_2}=0,1.22,4=2,24\left(l\right)\)

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mik làm đc rồi mn không phải làm nữa đâu

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Hà Thu Trang
10 tháng 3 2020 lúc 17:36

Corona virus is a virus originating from Wuhan, China. First appeared on December 31, 2019, and began to spread quickly afterwards. Corona virus has been known to cause colds along with quite serious illnesses such as, Middle East Respiratory Syndrome (MERS) and Severe Acute Respiratory Syndrome (SARS). , The World Health Organization (WHO) initially proposed to use the provisional designation "2019-nCoV" to call this strain of the virus. Then, they call Covid 19.Human-to-human transmission has been confirmed. There have been reports that the virus was infectious even during incubation. However, officials at the Centers for Disease Control and Prevention (CDCC) in the United States stated that they "did not have any evidence". about the patient's infection before the onset of symptoms .A research team estimated that the virus's basic reproduction coefficient (also known as the basal infection coefficient, R_ {0}) ranges from 5 to 10, this means that one person infected with the virus can infect 5 to 10 others. Other research groups have estimated that the basic reproductive index could be from 2 to 4.5.Symptoms reported include fever in 90% of cases, fatigue and dry cough in 80% of cases,  20% suffer from shortness of breath and respiratory failure accounts for 15% .Blood tests often show a low white blood cell count.Good self-protection includes: maintaining good hand hygiene and breathing (do not touch the eyes, nose, mouth) persevere safe eating habits, do our best to avoid contact be intimate with anyone who has a respiratory illness (such as coughing and sneezing). There is currently no specific cure for the new type of Corona virus. However, many conditions can be treated, so a patient's clinical situation is required to conduct treatment. Taking care of and helping the sick person can be extremely effective.

 Mô phỏng một virus SARS-CoV-2   Minh họa cắt ngang của virus SARS-CoV-2 hiển thị các thành phần bên trongVirion SARS-CoV-2 với coronae có thể nhìn thấy

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trinhngocgiavinh
21 tháng 3 2020 lúc 20:47

nhìn trên báo cũng đc mà

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Dương Hoàng Nam
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Minh Hiếu
25 tháng 9 2021 lúc 17:35

1) \(\sqrt{2x-5}=7\)

\(\left(\sqrt{2x-5}\right)^2=7^2\)

\(2x-5=49\)

\(2x=54\)

\(x=27\)

2) \(3+\sqrt{x-2}=4\)

\(\sqrt{x-2}=1\)

\(\left(\sqrt{x-2}\right)^2=1^2\)

\(x-2=1\)

\(x=3\)

Lấp La Lấp Lánh
25 tháng 9 2021 lúc 17:38

1) \(\sqrt{2x-5}=7\left(đk:x\ge\dfrac{5}{2}\right)\)

\(\Leftrightarrow2x-5=49\Leftrightarrow2x=54\Leftrightarrow x=27\left(tm\right)\)

2) \(3+\sqrt{x-2}=4\left(đk:x\ge2\right)\)

\(\Leftrightarrow\sqrt{x-2}=1\Leftrightarrow x-2=1\Leftrightarrow x=3\)

3) \(\Leftrightarrow\sqrt{\left(x-1\right)^2}=1\Leftrightarrow\left|x-1\right|=1\)

\(\Leftrightarrow\left[{}\begin{matrix}x-1=1\\x-1=-1\end{matrix}\right.\)\(\Leftrightarrow\left[{}\begin{matrix}x=2\\x=0\end{matrix}\right.\)

4) \(\Leftrightarrow\sqrt{\left(x-2\right)^2}=1\Leftrightarrow\left|x-2\right|=1\)

\(\Leftrightarrow\left[{}\begin{matrix}x-2=1\\x-2=-1\end{matrix}\right.\)\(\Leftrightarrow\left[{}\begin{matrix}x=3\\x=1\end{matrix}\right.\)

5) \(\Leftrightarrow\sqrt{\left(2x-1\right)^2}=\sqrt{\left(x+4\right)^2}\)

\(\Leftrightarrow\left|2x-1\right|=\left|x+4\right|\)

\(\Leftrightarrow\left[{}\begin{matrix}2x-1=x+4\\2x-1=-x-4\end{matrix}\right.\)\(\Leftrightarrow\left[{}\begin{matrix}x=5\\x=-1\end{matrix}\right.\)

6) \(ĐK:x\ge-2\)

 \(\Leftrightarrow5\sqrt{x+2}-3\sqrt{x+2}-\sqrt{x+2}=\sqrt{x+7}\)

\(\Leftrightarrow\sqrt{x+2}=\sqrt{x+7}\)

\(\Leftrightarrow x+2=x+7\Leftrightarrow2=7\left(VLý\right)\)

Vậy \(S=\varnothing\)

7) \(ĐK:x\ge-1\)

\(\Leftrightarrow5\sqrt{2x+1}+3\sqrt{x+1}=4\sqrt{x+1}+4\sqrt{2x+1}\)

\(\Leftrightarrow\sqrt{2x+1}=\sqrt{x+1}\)

\(\Leftrightarrow2x+1=x+1\Leftrightarrow x=0\left(tm\right)\)

Nguyễn Hoàng Minh
25 tháng 9 2021 lúc 17:43

\(3,\sqrt{x^2-2x+1}=1\left(x\in R\right)\\ \Leftrightarrow\sqrt{\left(x-1\right)^2}=1\\ \Leftrightarrow\left|x-1\right|=1\Leftrightarrow\left[{}\begin{matrix}x-1=1\left(x\ge1\right)\\x-1=-1\left(x< 1\right)\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=2\left(tm\right)\\x=0\left(tm\right)\end{matrix}\right.\)

\(4,ĐK:x\in R\\ PT\Leftrightarrow\sqrt{\left(x-2\right)^2}=1\\ \Leftrightarrow\left|x-2\right|=1\Leftrightarrow\left[{}\begin{matrix}x-2=1\left(x\ge2\right)\\x-2=-1\left(x< 2\right)\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=3\left(tm\right)\\x=1\left(tm\right)\end{matrix}\right.\)

\(5,ĐK:x\in R\\ PT\Leftrightarrow\left|2x-1\right|=\left|x+4\right|\\ \Leftrightarrow\left[{}\begin{matrix}2x-1=x+4\\1-2x=x+4\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=5\\x=-1\end{matrix}\right.\)

\(6,ĐK:x\ge-2\\ PT\Leftrightarrow5\sqrt{x+2}-3\sqrt{x+2}-\sqrt{x+2}=\sqrt{x+7}\\ \Leftrightarrow\sqrt{x+2}=\sqrt{x+7}\Leftrightarrow x+2=x+7\Leftrightarrow0x=5\Leftrightarrow x\in\varnothing\)

\(7,ĐK:x\ge-1\\ PT\Leftrightarrow5\sqrt{x+2}+3\sqrt{x+1}=4\sqrt{x+1}+4\sqrt{x+2}\\ \Leftrightarrow\sqrt{x+2}=\sqrt{x+1}\\ \Leftrightarrow x+2=x+1\\ \Leftrightarrow0x=-1\Leftrightarrow x\in\varnothing\)

Phạm Bảo Ngọc
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Vĩnh biệt em, chị để mất...
6 tháng 11 2021 lúc 18:03

Do you l.i.k.e English? - Yes, i do

@Bảo

#Cafe

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Phạm Ngọc Minh Phước
6 tháng 11 2021 lúc 18:13

TL:

Do you L-I-K-E English ?

_HT_

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🍧《Akarui♌tsuki》🍨
6 tháng 11 2021 lúc 18:16
Do you like English?-Yes,I do
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