vâng ạ

Hh

-_-

1 A balanced lifestyle can lead to improved health if it is adopted consistently.

2 Harry apologized to his mom for not having returned home on time.

3 It is obligatory for us to attend the mandatory training session.

4 It has been two months since he last experienced a family quarrel.

5 Susan's failure to understand the math problems made her feel frustrated.

Question 1. A balanced lifestyle can lead to improved health if we adopt it consistently. (adopted)

=> A balanced lifestyle can lead to improved health if it is adopted consistently

Question 2. “I’m sorry for not returning home on time, Mom”, Harry said. (apologized)

Harry apologized to his mom for not returning home on time

Question 3. We are obligated to attend the mandatory training session. (to)

It is obligatory for us to attend the mandatory training session

Question 4. He hasn’t experienced a family quarrel for two months. (last)

The last time he experienced a family quarrel was two months ago

Question 5.  Susan failed to understand the math problems. That made her feel frustrated. (failure)

Susan's failure to understand the math problems made her feel frustrated.

Question 1. Member nations/ have / reason / attend / summits / discuss /shared goals.

Member nations have a reason to attend summits to discuss shared goals

Question 2. His respiratory health /gradually / become / better / since / he quit / smoke.

His respiratory health has gradually become better since he quitted smoking

Question 3. It / forbidden / litter / public places / Vietnam / keep the environment / clean. 

It is forbidden to litter in public places in Vietnam to keep the environment clean

Question 4. During / holiday season, / the city /  look / festive / joyful, / decorate / with / lights and decorations.

During the holiday season, the city looks festive and joyful, decorated with lights and decorations

Question 5. My mom / charge / resolve / family argument / find / solution.

My mom takes charge to resolve family arguments and find solutions

1.Member nations have a reason for attending summits to discuss shared goals.

2.His respiratory health has gradually become better since he quit smoking.

3. It is forbidden to litter in public places in Vietnam to keep the environment clean.

 4.During the holiday season, the city looks festive and joyful, decorated with  lights and decorations.

 5.My mom was in charge of resolving the family argument and finding a solution.

a á ớ

đọc thấy rối quá ạ

(em mới lớp 5 ạ)

chúc mn giải đc nha

Living in a smart city brings many benefits and disadvantages. In this article, I will present some pros and cons of living in a smart city.

The first advantage of living in a smart city is convenience. Information and communications technology is integrated into urban systems, helping to provide public services more effectively. For example, through mobile applications, people can easily search for information about transportation, destinations, and entertainment activities. Furthermore, the smart traffic system helps reduce congestion and save travel time.

Another advantage of smart cities is energy saving and environmental protection. Advanced technologies are applied to manage and use resources effectively. For example, automatic lighting and temperature regulation in buildings help save energy. In addition, the use of smart public transport and self-driving cars helps reduce polluting emissions.

However, living in a smart city also has disadvantages. One of them is the issue of information security. With the widespread use of information technology, the risk of personal information insecurity and privacy violations increases. This requires strong security measures to ensure the safety of people's personal data.

Another drawback of smart cities is their dependence on technology. If technology systems fail or are attacked, public services could be disrupted. This poses challenges for maintaining stability and ensuring security of smart cities.

In short, living in a smart city brings many benefits such as convenience and energy savings. However, it is also necessary to pay attention to information security issues and dependence on technology. To make the most of the advantages and minimize the disadvantages, smart investment and management from city managers is needed.
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ối giời ơi cái j vậy

Khó thế em mới học lớp 5

1e+84937

Ta có x_n luôn dương

Ta có \(2x_n+1=\) \(2\times\dfrac{\left(2+cos\alpha\right)x_n+cos^2\alpha}{\left(2-2cos2\alpha\right)x_n+2-cos2\alpha}+1=\)

\(=\dfrac{6x_n+2cos^2\alpha+2-cos2\alpha}{\left(2-2cos2\alpha\right)x_n+2-cos2\alpha}\)

\(=\dfrac{6x_n+2cos^2\alpha+2sin^2a+1}{\left(2x_n+1\right)\left(1-cos2\alpha\right)+1}\)

\(=\dfrac{3\left(2x_n+1\right)}{2\sin^2\alpha\left(2x_n+1\right)+1}\)

\(\Rightarrow\dfrac{1}{2x_{n+1}+1}=\dfrac{2\sin^2\alpha\left(2x_n+1\right)+1}{3\left(2x_n+1\right)}\)

\(=\dfrac{1}{3}\left(2\sin^2\alpha+\dfrac{1}{2x_n+1}\right)\)

\(\Rightarrow\dfrac{1}{2x_{n+1}+1}-\sin^2\alpha=\dfrac{1}{3}\left(\dfrac{1}{2x_n+1}-\sin^2\alpha\right)\)

\(\Rightarrow\dfrac{1}{2x_{n+1}+1}-\sin^2\alpha=\left(\dfrac{1}{3}\right)^n\left(\dfrac{1}{2x_1+1}-\sin^2\alpha\right)\)

\(=\left(\dfrac{1}{3}\right)^n\left(\dfrac{1}{3}-\sin^2\alpha\right)\)

\(\Rightarrow y_n=\sum\limits^{n-1}_{i=0}\left(\dfrac{1}{3}\right)^i\left(\dfrac{1}{3}-\sin^2\alpha\right)+n\sin^2\alpha\)

\(=\dfrac{1-\left(\dfrac{1}{3}\right)^n}{1-\dfrac{1}{3}}\left(\dfrac{1}{3}-\sin^2\alpha\right)+n\sin^2\alpha\)

\(x_1=a>2;x_{n+1}=x_n^2-2,\forall n=1,2,...\)

mà \(n\rightarrow+\infty\)

\(\Rightarrow a\rightarrow+\infty\Rightarrow x_n\rightarrow+\infty\)

\(\Rightarrow\lim\limits_{n\rightarrow+\infty}\dfrac{1}{x_n}=0\) \(\Rightarrow\lim\limits_{n\rightarrow+\infty}\left(\dfrac{1}{x_nx_{n+1}}\right)=0\)

\(\)\(\Rightarrow\lim\limits_{n\rightarrow+\infty}\left(\dfrac{1}{x_1}+\dfrac{1}{x_1x_2}+\dfrac{1}{x_1x_2x_3}+...+\dfrac{1}{x_1x_2...x_n}\right)=0\)

...