tham khảo ở đây nè bn

Ta có: 1² + 2² + 3² + ... + 10² = 385

S = 2² + 4² + 6² + ... + 20²

= (1.2)² + (2.2)² + (3.2)² + ... + (10.2)²

= 1².2² + 2².2² + 3².2² + ... + 10².2²

= 2² (1² + 2² + 3² + ... + 10²)

= 4.385 = 1540

troll à bn? câu này là tiếng anh mà?

Put the verbs in correct tenses

1. Do your parents go (go)to work at 8 o'clock?

2. Are you waiting (wait) for your teacher?

3. I don't want to cook (cook) tonight.Let's eat (eat) out

4.My sister always wears (wear) nice clothes for work.Today she is wearing (wear) a long dress

5.You look ( look) tired. Do You feel (feel) hungry? Would You like (like) some bread

Fill in the gaps with suitable prepositions

1.we always go .....to....the city center....with....our own car.

2.i am going .....to....New York ...for....my vacation next week

3.i am looking....for....chocolates

4.she wants a sandwichs and a glass....of....lemon juice

( 742+258) + 316=1000 + 356=1356

Bị động thì hiện tại hoàn thành

1.Have you tidied the kitchen yet?

-> Has the kitchen been tidied yet?

2.They have just given the children some gift.

-> The children has just been given some gift.

3.She has just bought a nice bike

-> A nice bike has just been bought.

4.We have waited for him for 2 years ago.

-> He has been waited for 2 years.

5.This house has just been built by Mr Lan.

-> Mr Lan has just built this house.

mk sửa lại: câu 3 là "Tuan has just been ...." nha bn, nãy thiếu chữ just

1. if/go/want/medicine/have/to/you/to/study/university/too.

-> If you want to go to university, you have to study medicine too.

2.being/enjoy/a/ lot/given/of/lucky/by/children/money/adults.

-> Children enjoy being given a lot of lucky money by adults.

3.nominated/been/activist/as/the/Tuan/has/in/the/town/charity/most/just/effective/program.

-> Tuan has been nominated as the most effective activist in the town charity program.