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CHÚC EM HỌC TỐT NHÉ 

ê bn cho mik bt tên bài ko mik cx đang cần giải bài này

:v

a: \(=\dfrac{1}{2}\cdot\dfrac{2}{3}\cdot...\cdot\dfrac{2021}{2022}=\dfrac{1}{2022}\)

b: \(=\dfrac{2\left(\dfrac{1}{3}+\dfrac{1}{5}-\dfrac{1}{7}\right)}{11\left(\dfrac{1}{3}+\dfrac{1}{5}-\dfrac{1}{7}\right)}=\dfrac{2}{11}\)

Chiều rộng hình chữ nhật là :

\(\dfrac{17}{2}:3=\dfrac{17}{6}\left(cm\right)\)

Diện tích hình chữ nhật là :

\(\dfrac{17}{6}.\dfrac{17}{2}=\dfrac{289}{12}\approx24\left(cm^2\right)\)

Chiều rộng của hình chữ nhật: 

\(\dfrac{17}{2}:3=\dfrac{17}{6}\left(cm\right)\)

Diện tích của hình chữ nhật:

\(\dfrac{17}{2}.\dfrac{17}{6}=\dfrac{289}{12}\approx24,08\left(cm^2\right)\)

chiều rộng hình chữ nhật là:

17/2:3=17/6

Diện tích hình chữ nhật là:

17/2x17/6=289/12

\(a) Fe + 2HCl \to FeCl_2 + H_2\\ b) n_{Fe} = n_{H_2} = \dfrac{2,24}{22,4} = 0,1(mol)\\ m_{Fe} = 0,1.56 = 5,6(gam)\\ n_{Cu} = 12-5,6 = 6,4(gam)\)

\(Fe+2HCl\rightarrow FeCl_2+H_2\)

\(Cu+HCl\) \(\rightarrow\)không phản ứng

\(n_{H_2}=\dfrac{2.24}{22.4}=0.1\)

\(m_{Fe}=0.1\cdot56=5.6g\)

\(m_{Cu}=12-5.6=6.4g\)

tìm b giúp 

\(220-\frac{b}{b}=\frac{4}{7}\)

\(\Leftrightarrow\frac{b}{b}=220-\frac{4}{7}\)

\(\Leftrightarrow\frac{b}{b}=\frac{1536}{7}\)

\(\Leftrightarrow b\)không tồn tại nghiệm số thực

\(\Leftrightarrow b\in\varnothing\)

There are many sports, which are good for our health and popular over the world. Soccer is one of my favorite sports. It is played by two teams consisting of 11 people each team. The general rule is that the ball is kicked by leg and the players get score when having the ball in their goal post. Football is known as “king” among other sports. First, it improves integrity when applying several techniques to create strong power. Second, it not only reduces stress and bad cholesterol of body but also relaxes out spirit after a hard working day. My brother usually plays football every afternoon after work as he is in a local sport club. Moreover, football is not simply one kind of sport, it is an art because of the popularity. Since there is an increasing number of football team over the world such as: Manchester United, Barcelona, Arsenal with professional players. Although I am not able to play well, I love watching football matches as they are interesting and we can also learn from their technique. Furthermore, football is public concern as well as heated debate. Football is now popular through women, who are thought not able to play this kind of sport.

My favourite sport is football, It has been my favourite sport almost for 5 years. Nowadays, most of people in the world football so it is called the king of sports. Why do people it, I think the most reason is it easy to play, you can play football every where if you just have a ball with the right size. Not only men play football but also women can play, many big and famous football clubs have large stadiums with alot of fans all over the world. Anyways football always is the most favourite sport of mine.                                                                                                                                                                    THE END

My favorite hobby is playing football in spare time. After completing my home work at home, I generally spend my lot of free time in playing football. I was so interested to play football from my childhood however started learning to play well when I was 5 years old. I was in one class when I was 5 years old. My father asked to my class teacher in the PTM about my hobby of football. And my teacher told him that there is a facility of playing sports daily in the school from class 1 so you can admit your child. Now, I really enjoy playing football and paripate in the inter-school competitions

đề thi có liên quan tới công, công suất palanh, lực đẩy, và ma sát nhé

Đề rễ i như vong 7 chi khó hơn 1 tí thôi

Cảm ơn các bạn nhé. Viết tắt chữ Vật Lý thành ra *****. Vãi

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1 giờ 60p lấy 60x2:3 lần lượt cách khác là lấy 60x2/3 xong + 15