Ta có: \(\left(x+2\right)\left(x^2+2x+2\right)-x\left(x-8\right)^2=\left(4x-3\right)\left(4x+3\right)\)

\(\Leftrightarrow x^3+2x^2+2x+2x^2+4x+4-x\left(x^2-16x+64\right)=16x^2-9\)

\(\Leftrightarrow x^3+4x^2+6x+4-x^3+16x^2-64x-16x^2+9=0\)

\(\Leftrightarrow4x^2-58x+13=0\)

\(\Leftrightarrow\left(2x\right)^2-2\cdot2x\cdot\frac{58}{4}+\frac{3364}{16}-\frac{789}{4}=0\)

\(\Leftrightarrow\left(2x-\frac{58}{4}\right)^2=\frac{789}{4}\)

\(\Leftrightarrow\left[{}\begin{matrix}2x-\frac{58}{4}=\frac{\sqrt{789}}{2}\\2x-\frac{58}{4}=-\frac{\sqrt{789}}{2}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}2x=\frac{\sqrt{789}}{2}+\frac{58}{4}=\frac{29+\sqrt{789}}{2}\\2x=-\frac{\sqrt{789}}{2}+\frac{58}{4}=\frac{29-\sqrt{789}}{2}\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=\frac{29+\sqrt{789}}{4}\\x=\frac{29-\sqrt{789}}{4}\end{matrix}\right.\)

Vậy: \(x\in\left\{\frac{29+\sqrt{789}}{4};\frac{29-\sqrt{789}}{4}\right\}\)

Viết lại câu sao cho nghĩa không đổi

Who invented the telephone?

=>Who was the inventor of telephone?

Having a"balanced diet'is very important

=> It is very important to have a"balanced diet'

In order to stay healthy it is important to have a balanced diet. We should eat enough three main groups of food. These groups are protein, carbohydrate and fat.

Proteins are very important for building our body. They help us to build new cells as old ones die. Meat and milk products are major sources of protein. We can also get protein from fish, eggs and beans.

Carbohydrate and fat are important to enable us to store energy. Carbohydrates are found in sugar and in cereals. Fat can be found in vegetable oil, in butter and in nuts.

Our body also needs minerals, such as iron and calcium and vitamins. Fish, vegetables and milk contain most of the minerals we need. Vitamins are found in fresh vegetables and fruit.

1. According to the passage, a balanced diet…………..

A. is needed for good health.                       B. contains lots of fruit and vegetables.

C. is rich in minerals and vitamins               D. is high in protein.

2. Proteins…………..

A. can only be found in meat.                       B. help our body build new cells.

C. produce meat and milk.                            D. can be gotten from rice.

3. We can get fat from…………..

A. cereals                   B. sugar                      C. butter                     D. vegetables

4. Carbohydrates…………..

A. allow the body to store energy                B. are not found in rice and cornmeal

C. supply a lot of protein                              D. are the most important of three groups of food

5. Which of the following is not true?

A. It’s important to eat a balanced died.      B. Fish contain both protein and mineral

C. Iron and calcium are also essential for good health.

D. Vitamins are not necessary for our body

1. It's important to have a "balanced diet"

2. You had better not drink too much coffee.

3. Mr. Terry isn't used to driving on the right.

1 We should have a balance diet

2 Would you play table tennis with Nam?

3 Sugar adds taste to food and it gives you energy

4 Brushing your teeth is very important

5 I like to watch programs about teenagers in other countries.

chị trả lời ở dưới rồi con gì em?

Read and answer the questions below:

We know that the food we eat affects our whole life, so we must remember to eat sensibly. We should have a balanced diet. What does a "balanced diet" mean? It means you eat a variety of food without eating too much of anything. Moderation is very important. Eat the food you enjoy, but don't have too much. This will help you stay fit and health.

1. Does the food we eat affect out life? No, it doesn't

2. How should we eat? We should have a balanced diet

3. Wwhat does a "balanced diet" mean?It means you eat a variety of food without eating too much of anything.

4. Should we eat the food we enjoy?Yes,we should but don't have too much

5. What wull a "balanced diet" help you?This will help you stay fit and health.

what - stay - variety - must - affects - balanced - moderation - but

We know that the food we eat ___affects____ our whole life, so we remember to eat sensibly. We should have a ___balanced__ diet. ____What____ does a 'balanded diet' means ? It means you eat a ___variety____ of foods without eating too much of anything. ___Moderation___ is very important. Eat the food you enjoy , ___but___ don't have too much. This will help you ____stay___ fit and healthy.

Hoàn tất đoạn văn với các từ sau

what - stay - variety - must - affects - balanced - moderation - but

We know that the food we eat _____affects__ our whole life, so we remember to eat sensibly. We should have a ___balanced__ diet. ____what____ does a 'balanded diet' means ? It means you eat a ___variety____ of foods without eating too much of anything. ___moderation___ is very important. Eat the food you enjoy , ____but__ don't have too much. This will help you _____stay__ fit and healthy.

1. Yes , diet is very important to everyone's life . Scientific diet can help us to be healthier .
2. A balanced diet is a diet that includes different foods in certain quantities and proportions such that the need for calories , protein , vitamins , minerals and alternative nutrients is Sufficient and small amounts are stored for short-term replenishment of nutrients .
3. They often eat water dishes such as vermicelli , pho , noodles , noodle soup , ... and broken rice (  hahah, that sounds weird ) . At noon they eat takeaway or at a restaurant and in the evening they go to a restaurant or cook at home .
4. Yes , in my country I am not sure , but in my locality it is very much . They eat at restaurants most of the week and even months .
5. Because they are lazy to cook and they don't know how to cook . For them , the food outside the restaurant is delicious and convenient .

1. I think diet is important for vegetarians or somebody who wants to lose their weight.
2. A balanced diet is the menu of vegetables, fruits, healthy dish and there is no fish, meat or something related to animals that provides our bodies with all the vitamins and nutrients.
3. In my country, they often eat a lot of vegetables and fruits in three big meals in a day. Some people is very healthy because they do the diet everyday, but some other people are the complete opposite of them, like me, for example, if I can't eat meat or fish for a day...... Oh, it is so scary! :)
4. Yes, they do. For example, in Hanoi, we prefer eating at home to going out, but in Ho Chi Minh city, they always go out to have breakfast, lunch, dinner and sometimes I read on my aunt's Facebook, they post a photo with the title:" How to fry the eggs?" or " My dark meal :((("
5. I think it's more convinient for everybody and if you want to "change the wind", let's go out now! Of course it is more expensive but it's worth, right?
This is my opinions, it may be wrong. I'll be very pleasure for your comments
Thanks for reading and have a good day, :)))))
 

1. Yes

2. A balanced diet is a diet that helps maintain or improve overall health. A balanced diet provides the body with essential nutrition containing: fluid, macronutrients, micronutrients, and adequate food energy.
3. The Vietnamese Diet. The traditional Vietnamese diet is healthy. Meals emphasize rice, vegetables and fish, and cooking methods often involve steaming or stir-frying. Rice is the staple of the diet, consumed in some form in almost every meal.
4. I don't think so
5. 

- Eating out is fun. You go out, see people, and eat food that you usually do not cook at home.

- Eating out is a symbol of status. It means that the person eating out can afford it.

- Sometimes, people want to save time, and instead of going to the grocery or supermarket, buy food, cook it, and then wash the dishes, they prefer to go to a restaurant. People, who work away of home, prefer to eat at a restaurant near their work place. Of course, tourists eat in restaurants, diners, coffee houses, market stalls, and anywhere where they sell food.

- In certain places, at weekends or holidays, you can see crowds waiting outside restaurants, waiting for a table. At some of the restaurants, especially at weekends or holidays, you cannot find a table, unless you have reserved one in advance.

- The above are a few other reasons why people eat out, but I would like to focus of one reason of the reason – fun and pleasure.

I think diet is important for us because focusing on that would make us healthy. In my opinion, balanced diet is that you eat each type of food just enough, no more or less. For instance, you have to eat meat less than fruits and vegetables. Most of Vietnamese people have rice for there diet, and lots of people prefer to have canned food. Many people enjoy eating out when they busy and don not have time to make their own food and the food might be better. I think the most different between restaurant food and cooked food is that the food in restaurants is usually better than cooked food.

1.I think yes because the diet is quite important because it affects both our weight and our body.

2.A balanced diet is the right diet that provides our bodies with all the vitamins and nutrients it needs to function properly.

3.They often eat a lot of vegetables for breakfast, lunch, dinner and in between snacks they often eat fruit.

4.Some people like to eat out because they don't have enough time to prepare their meals, they like to eat out because they are attracted to them, delicious food.

5.The difference is that the food outside the restaurant can't be 100% sure that they are good for health and ensure proper food safety and hygiene or how to prepare food, where the source of that food is unknown. As for home-made food, we make sure that the place where we buy food is a hygienic place, the way we prepare food in accordance with hygienic regulations and that the food is good for health.

1. Do you think diet is important?

-Yes, I do

2. What is a balanced diet?

-A balanced diet is to eat so that there are enough nutrients needed by the body.

3. What is the typical diet of people in your country?

-The diet in my country is quite diverse. In places with difficult economic conditions, the diet will often be very frugal. But in places with better economic conditions, the diet will be very rich.

4. Why do some people ẹnjoy to eat out?

-Because many people don't have time to cook at home, or maybe they go out to eat so they can enjoy better food.

5. What is the difference between restaurant food and home cooked food?

- Restaurant food may taste better than home-cooked food, but the quality may not be as good as home cooked food.