áp dụng tính chất của dãy tỉ số bằng nhau ta có:

\(x=\frac{y}{2}=\frac{z}{3}=\frac{x+y+z}{1+2+3}=\frac{2}{6}=\frac{1}{3}\)

suy ra : 

\(x=\frac{1}{3}\)

\(\frac{y}{2}=\frac{1}{3}\Rightarrow y=\frac{2.1}{3}=\frac{2}{3}\)

\(\frac{z}{3}=\frac{2}{3}\Rightarrow z=\frac{2.3}{3}=2\)

1.Which/difficult/English /or / math ?

Which is more difficult English or Math?

-House => Houses.

-Park => Parks.

-Place => Places.

-Tree => Trees.

-Yard => Yards.

-Hotel => Hotels.

-Lake => Lakes.

-Street => Streets.

-City => Cities.

-River => Rivers.

-Village => Villages.

-Flower => Flowers

1. lake / near / hotel

=> There is a lake near the hotel.

2. armchair / in / living room

=> There is an armchair in the living room.

3. flowers / in / park

=> There are flowers in the park.

4. two hotels / on / street

=> There are two hotels on the street.

5. rice paddy / near / lake

=> There is a rice paddy near the lake.

6. trees / in / school yard

=>There are many trees in school yard.

1. The music festival this year is as good as it was last year.

2. The concert will be broadcast 'live': that means it comeoonn TV at the same time as it is performed.

3. This camera is not as expensive as I thought at first.

4. Your taste in art is quite different from mine.

5. Some people say that Spider-Man 2 is as boring as Spider-Man 1.

6. My mother is always as busy as a bee.

3. Who is famous for the song Top of the World ?

A. Kanen Carpenter

B. Celine Dion

C. Susan Boyle

4. Which of the following became a World Heritage in 2009 ?

A. Hat cheo

B. Cai luong

C. Quan ho Bac Ninh

x*(x+1)=2+4+6+8+10

x*(x+1)=30

=> x=5

Thử lại:

5*(5+1)=30

Đúng nha!

2. Which of the following is Korean ?

A. Mua Sap

B. Ballet

C. Gangnam Style

One of the world's largest libraries is the United States' Library of Congress. It is in Washington D.C, the capital of the USA. It receives copies of all American books. It contains over 100 million books. It has about 1,000 km of shelves. It has over 5,000 employees.

=> Một trong những thư viện lớn nhất thế giới là Thư viện Quốc hội Hoa Kỳ. Nó là ở washington D.C thủ đô của Hoa Kỳ. Nó nhận được bản sao của tất cả các sách của Mỹ. Nó chứa hơn 100 triệu cuốn sách. Nó có khoảng 1.000 km kệ. Nó có hơn 5.000 nhân viên

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