M.n giúp mình với nào, bài dài quá
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DT
1
DT
11 tháng 12 2021
1, chỉ cách làm mẫu nek:
NO+O2=>NO2
NO+O2 là vế 1, NO2 là vế 2
vế 1 : N=1, O=3
vế 2 : N=1, O=2
cân bằng:
vế 2: 2O2( O vế 2 ít ng tử hơn )
lúc này vế 2 có O=4 vàN=2
vế 1: 2NO
lúc này vế 1 N=2, O=4
kl : 2NO+O2=>2NO2
2 , làm y như nãy:
4P+5O2=>2P2O5
3, Fe2O3+3H2SO4=>Fe(SO4)3+3H2O
J
12 tháng 7 2017
để\(\frac{2x-1}{3+x}\Leftrightarrow\orbr{\begin{cases}\hept{\begin{cases}2x-1< 0\\3+x>0\end{cases}}\\\hept{\begin{cases}2x-1>0\\3+x< 0\end{cases}}\end{cases}}\Leftrightarrow\orbr{\begin{cases}\hept{\begin{cases}x< \frac{1}{2}\\x>-3\end{cases}\left(ktm\right)}\\\hept{\begin{cases}x>\frac{1}{2}\\x< -3\end{cases}\left(tm\right)}\end{cases}}\)
Vậy -3<x<1/2
AT
1
4 tháng 6 2021
1, set about: attack someone
2, call back: return to see or collect sth
3, pay me back: return money to someone you borrow
4, go right back to: kiểu nó bắt đầu từ thời Trung Cổ ấy
5, look after: chắc cái này bạn biết nhỉ
6, set about: start doing something
7, turn back: return
8, went about: begin to do something or deal with something
9, called me back: telephone someone again
10, holding back: stating sth
HK
6
26 tháng 9 2021
Bài 3:
Chiều rộng là:
\(\dfrac{11}{4}-\dfrac{3}{2}=\dfrac{11}{4}-\dfrac{6}{4}=\dfrac{5}{4}\left(m\right)\)
Chu vi là:
\(\left(\dfrac{11}{4}+\dfrac{5}{4}\right)\cdot2=\dfrac{16}{4}\cdot2=4\cdot2=8\left(m\right)\)
Diện tích là:
\(\dfrac{11}{4}\cdot\dfrac{5}{4}=\dfrac{55}{16}\left(m^2\right)\)
GG
Giúp mình viết 1 bài speaking chủ đề My hobbies is playing video games với tầm 3 4 đoạn đừng quá dài
1
HT
14 tháng 3 2020
I find playing online games very interesting. It can support me to feel relaxative after everyday after tired time of learning at school. I usually to play online chess. It is exciting and challenging. It also help me to make friends online. It helps me to think over everything before acting. However, I always limit my time of playing online games. Because I think playing too much online games makes me tired. My eyes are often soring. My mother always reminds me of learning hard, so I know what is the most important to me. Playing online games only helps me to relax a little. So I advise you to working hard at school, and just spend a little time playing online games, although how much you it.
HN
3
9 tháng 12 2016
Watching television is one of the activities I like to do in my spare time. I enjoy watching cartoons on Saturday mornings and sports programs on Sunday afternoons. I also watch television during the week after I have finished all my school work. At night, I especially like to watch movies and situation comedies. If I have a lot of homework, I try to arrange my schedule so that I can watch at least one of my favorite shows. Watching television is not the only activity that I do in my spare time. My other favorite activities are making paper flowers and going shopping with my friends. However, when I have spare time, I spend more time watching television than any other activities. Watching television can help me not only relax but also build me a huge knowledge of the open world.”
LY
9 tháng 12 2016
There are three activities I like to do most in my free time. The first is cartoon. I like watching cartoons very much.I like watching cartoons very much, especially 'Total spies' because it is very exciting and funny. I often watch it with my friends to relax. Second, I also play football with my brother and my friends in our school yard when I have free time. I think football is a sport which helps us have good health and study better.Finally, I like reading books best. Since reading books is helpful, you can learn about another culture and widen your knowledge. Moreover, it is a form of entertainment, which is useful to our life. All in all, I find that if I do not have anything to do in my free time, I will be very bored. Therefore, you should also choose some activities for yourself to do, which help you have a healthy way of life.
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