Mn ơi giải tiếng anh giúp e vs
K
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H
18 tháng 10 2021
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.
30 tháng 9 2021
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
\(V_{SO_2}=0,1.22,4=2,24\left(l\right)\)
S
3
HT
10 tháng 3 2020
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.
MH
25 tháng 9 2021
1) \(\sqrt{2x-5}=7\)
\(\left(\sqrt{2x-5}\right)^2=7^2\)
\(2x-5=49\)
\(2x=54\)
\(x=27\)
2) \(3+\sqrt{x-2}=4\)
\(\sqrt{x-2}=1\)
\(\left(\sqrt{x-2}\right)^2=1^2\)
\(x-2=1\)
\(x=3\)
25 tháng 9 2021
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) \(ĐK:x\ge-1\)
\(\Leftrightarrow5\sqrt{2x+1}+3\sqrt{x+1}=4\sqrt{x+1}+4\sqrt{2x+1}\)
\(\Leftrightarrow\sqrt{2x+1}=\sqrt{x+1}\)
\(\Leftrightarrow2x+1=x+1\Leftrightarrow x=0\left(tm\right)\)
6 tháng 11 2021
Do you l.i.k.e English? - Yes, i do
@Bảo
#Cafe
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 .