Football seems the most popular game in England. All of young and old people are fond of watching it. The important matches place at the weekends. As soon as the game begins, people start to shout and cheer on one side of other. Some even begin throwing things and fighting. People stop doing things when the game finishes.

My mother's name is Huong Quynh. She is a policewoman so she is busy almost the week. Although her job expects much time, she also spends time with me and my siblings. She has long black hair and dark eyes. Her hands are not beautiful as other because she does much housework every day to keep our house clean and keep us feel comfortable. My dad always away from our home(because he is a policeman too) so my mum does everything to look after us. I love my mum, not because of her appearance, not because she always makes us feel good, the only reason is she is my mum simply. And she is the person I want to be in the future. Love you mum, thanks for all you do for me.

Many plants and animals are in danger because we are destroying them.

Ba usually plays tennis in fall but sometimes he goes sailing.

Ta có:

\(10^n+72n-1=10^n-1+8.9.n=\left(10-1\right)\left(10^{n-1}+10^{n-2}...+1\right)+9.8.n\)

\(9\left(10^{n-1}+10^{n-2}+...+1\right)+9.8.n=9\left(8n+10^{n-1}+10^{n-2}+...+1\right)\)

Luôn luôn chia hết cho 9 

Ta chia cả tử số và mẫu số cho ƯCLN của chúng sẽ chỉ cần rút gọn 1 lần mà được phân số tối giản.

60

1. Paris is famous for the Eiffel Tower. (fame)

2. I think these thick clothes are very suited for cold weather. (suit)

3. It's traditional in England to eat turkey on Chrismas Day. (tradition)

4. On Chrismas Day, I often send my close friends greeting cards. (greet)

5. Tam Dao is a wonderful mountain resort in Viet Nam (mountain)

6. How careless of you to break that cup! (care)

7. We hate him because of his kindness unkindness to the children (kind)

8. The boy ate two of the cakes hungrily (hungry)

9. I had my bike repaired yesterday (repair)

10. Women nowadays have more freedom to participate in social activities (free)

Cách 1:

x+9 chia hết cho x+2

<=> x+2+7 v x+2

<=> 7 chia hết cho x+2

<=>x+2 thuộc Ư(7)={1;-1;7;-7}

<=> x thuộc {-1;-3;5;-9}

Cách 2:

x+9 chia hết cho x+2

Mà x+2 chia hết cho x+2

=> (x+9)-(x+2) chia hết cho x+2

<=> 7 chia hết cho x+2

<=>x+2 thuộc Ư(7)={1;-1;7;-7}

<=> x thuộc {-1;-3;5;-9}

Vậy x thuộc {-1;-3;5;-9}