Complete the sentences with the correct prepositions.

1. We have to use knife and fork ..... dinner.

2. There is a British tradition ..... having afternoon tea at 4 p.m.

3. She was very conscious ..... her lack of experience on her first day at work.

4. He has a new solution .... the problem.

5. Nobody helped him. He managed it ....... his own.

6. The drivers ..... London kept their cars ...... the left.

7. The summer holiday is coming. We are all excited ..... going .... a long trip ...... the South.

8. The children were amazed ........ the lion show at the circus.

9. Her small garden looks very beautiful in spring because all the flowers are ..... full bloom.

10. In our district, it's the custom ....... residents to sweep the streets on Saturday mornings.

Rút gọn các phân thức sau:

a, \(\dfrac{xy^3-yx^3}{x^{2^{ }}+xy}\)

b,\(\dfrac{x^5-1}{x^4+x^3+x^2+x+1}\)

Chứng minh rằng : 2⁶⁰ + 5³⁰ \(⋮\)41

Tìm số dư trong phép chia :

a, 38¹⁰ : 13

b, 40⁹ : 13

Make complete sentences based on the given words.

1. Clothing/ the Muong women/ diversified/ that/ men .

2. Muong/ be/ fourth/ largest/ ethnic minority group/ Vietnam/ Viet/ Tay/ Thai .

Fill in the blank with a suitable word or phrase, usinng the first letter(s) given.

1. The children are looking forward to helping their aunts at the h............. t .............

2. Sapa is very famous for its special market. It is l ............ m

Fill in the blank with the correct form of the given word.

1. It is necessary for every one to take part in the .............. activities of their village . COMMUNE

2. When you visit a Thai's house, you will be treated with the best ............................. SPECIAL

3. Everybody plays an important role in the .......... of the cultural heritages of the group they belong to . PRESERVE

4. The Khmer people are characterized by their unique .................... activities . ART

5. Although the peoples in Vietnam are diverse, they live ............... in the same nation PEACE

Cho : (a - b)² + (b - c)² + (c - a)² = 3.(a² + b² + c² - ab - bc ac). Chứng minh rằng : a=b=c

Cho a² - b²= 4c². Chứng minh rằng: (5a - 3b + 8c).(5a - 3b - 8c) = (3a - 5b)²

Tìm từ ngữ nghĩa rộng và nghĩa hẹp theo yêu cầu sau :

a, Cùng là tính từ

b, Cùng là danh từ

c, Cùng là động từ