1. History is an interesting subject ( interest )

2. They have difficultly in finding a suitable apartment ( difficult )

3. The most popular after - school activities are football and basketball ( act )

4. The company has only 60 employee ( employ )

5. The fastest way to travel is by plane ( fast )

6. Her English is gooder than mine ( good )

7. What a boring party! I'd like to go home ( bore )

8. Few students like him. He is an most popular teacher ( popular )

Miss Thanh ; Good morning, what is your name ?

Phương : My name's Phương.

Miss Thanh : What is your last name ?

Phương : It's Tran. My middle name is Minh.

Miss Thanh : How old are you, Phương?

Phương : I'm 13 years old.

Miss Thanh ; Where do you live?

Phương : I live 162/10B Hoang Van Thu Street

Miss Thanh : How far is it from house to your school?

Phương : It's about one kilometer.

Miss Thanh : How do you go to school ?

Phương : I go to school by bike

Let me tell you what I do everyday in here

Thành ngữ trong câu " Mẹ đã phải một nắng hai sương vì chúng con". giữ thành phần VỊ NGỮ trong câu.

Con đường ​khúc khuỷu ​gây khó khăn cho việc đến trường của các bạn nhỏ học sinh nơi đây.

My mother is very bad at drives car and bike.

They never get up late.

Gọi 2 ps đó là a/b và c/d (ƯCLN (a,b) = 1; ƯCLN (c;d) = 1)

Ta có;

\(\frac{a}{b}+\frac{c}{d}=m\) (m thuộc Z)

=> \(\frac{ad+bc}{bd}=m\)

=> ad + bc = mbd (10

Từ (1) => ad + bc chia hết cho b 

Mà bc chia hết cho b 

=> ad chia hết cho b

Mà (a,b) = 1

=> d chia hết cho b (2)

Từ (1) => ad + bc chia hết cho d 

Mà ad chia hết cho d 

=> bc chia hết cho d

Mà (c,d) = 1

=> b chia hết cho d (3)

Từ (2) và (3) =>bh = d hoặc b = -d (đpcm)

A. Factory B. History C. Family D. Day

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