x²+x+1 chia hết cho x-1

<=>x²-x+x+x+1 chia hết cho x-1

<=>x.x-x+x+1 chia hết cho x-1

<=>x.(x-1)+2x+1 chia hết cho x-1

<=>2x+1 chia hết cho x-1

Mà x-1 chia hết cho x-1 =>2.(x-1) chia hết cho x-1=>2x-2 chia hết cho x-1

Suy ra (2x+1)-(2x-2) chia hết cho x-1

<=> 3 chia hết cho x-1

<=> x-1 thuộc Ư(3)={1;-1;3;-3}

<=> x thuộc {2;0;4;-2}

Vậy x thuộc {2;0;4;-2}

x²+x+1 chia hết cho x-1

<=> x.x+x+1 chia hết cho x-1

<=>x.(x+1)+1 chia hết cho x-1

<=>1 chia hết cho x-1

<=>x-1 thuộc Ư(1)={1;-1}

<=>x thuộc {2;0}

Vậy x thuộc {2;0}

C1: What is the distance between Hanoi and Danang?

C2: How far is it from Hanoi to Danang?

In spring, the weather is warm and all the flowers bloom so I often go out with my family to enjoy the beautiful view. We go to some restaurants, play in some parks and sometimes go to the countryside. In summer, the season for the youth, I go to the swimming pool with my friend and eat some ice-cream. But sometimes, I stay at home and read books. It's my favourite activity. In autumn, when the leaves fall down, every week I go out with my sister and my brother to go cycling or play some games. The weather is dry and cold so we always put on our coats. In winter, the coldest season of the year, I stay at home almost the time and enjoy the hot drink. And I often sit down with my family and then we talk about our day and watch TV. Although the weather is so cold outside, I feel really warm.

1.Does he like cold drink?

2.Orange juice is her favourite drink.

3.We are going to visit Nha Trang this summer vacation.

4.How much milk does your mother want?

5.I will write a letter tomorrow

Vế A lá "trẻ em" còn vế B là "búp trên cành", từ so sánh là "như".

Bạn tham khảo ở đây nha

https://hoc24.vn/ly-thuyet/huong-dan-soan-bai-so-sanh.1959/

http://baigiang.violet.vn/present/show/entry_id/2349143

Do quá trình làm hoa khô cầu kì, công phu mà giá thành lại cao nên không phổ biến ở Việt Nam.