Gọi số tuổi của 3 người lần lượt là a,b,c

Ta có: a=2b=c+10

=> b=1/2 a; c=a-10

Do đó : a+b+c=30

hay a+1/2a+a-10=30

=> a+1/2a+a=40

5/2a=40

Nên a= 16

Từ đó ta suy ra b=8 ;c=6

Vậy số tuổi của ba bạn lần lượt là 16;8 và 6

Chúc bạn làm bài tốt :)

Call three chirle is a,b,c

I have: a= 2b = c+10

=> b =\(\frac{1}{2}\) a+a=10+30

=>a+\(\frac{1}{2}a+a-10=30\)

\(=>\frac{5}{2}a=40\)

*that you have to:a=16

And three chirlen are: b= 8 c=6

a=16

That well~ :>

Hoàn thành đoạn văn sử dụng was hoặc were.

I really enjoyed the party. It (0) was wonderful. Each guest (1) _was_ welcomed by the hostess in person. All the rooms (2) __were__ crowed with people. Everyone (3) __was__ enjoying themselves. A lot of people (4) _were__ dancing, and a number of people (5) __were_ swimming in the pool in the garden. All the people there (6) __were_ very smart. One of the guests (7) __was_ a famous lawyer. I didn't know many of the guests. None of my friends (8) were there.

Give the suitable form of the object in the brackets to complete the sentences . 

1. In this shop you can find the suitable things for your family .

2. I want a cheaper one . This one is quite expensive . 

3. This is my older sister . She is two years elder than me.

Give the suitable form of the object in the brackets to complete the sentences . 

1. In this shop you can find the suitable things for your family .

2. I want a cheaper one . This one is quite expensive . 

3. This is my older sister . She is two years elder  than me.

Change these sentences into passive :

1.No one has ever asked me that question before

That question has ever been asked me by before.

2.They haven't done anything since he left

Anything hasn't been done since he left.

3.A doctor has just examined John

John has just been examined.

4.They haven't used this machine for ages

This machine hasn't been used for ages.

5.Peter has sung this song

this song has been sung by peter.

6.They have paid doctors a lot of money

doctors have been paid a lot of money

7.She has eaten all the ages

all the eggs have been eaten by her

8.Famous engineers have designed the aircraft

the aircraft has been designed by famous engineers.

9.Have several people just seen the accident?

Has the accident just been seen by several people ?

10.We have invited all the members to the party.

all the members have been invited to the party by us.

Change these sentences into passive :

1.No one has ever asked me that question before

=>I have never been asked that question before.

2.They haven't done anything since he left

=>Nothing has been done by them since he left.

3.A doctor has just examined John

=>John has just been examnied by a doctor.

4.They haven't used this machine for ages

=>This machine hasn't been used for ages.

5.Peter has sung this song

==>This song has been sung by Peter.

6.They have paid doctors a lot of money

=>Doctors have been paid a lot of money.

7.She has eaten all the ages

=>All the ages have been eaten by her.

8.Famous engineers have designed the aircraft

=>The aircraft has been designed by famous engineers.

9.Have several people just seen the accident?

=>Has the accident just been seen by several people?

10.We have invited all the members to the party

=>All the members have been invited to the party.

SUPPLY THE CORRET FORM Ò THE ADJECTIVES IN BRACKETS

1 Her house is......bigger.......than mine (big)

2 That chair is....more comfortable.......than this one (comfortable )

3 Misa is....prettier.........of all the girls ( pretty)

4. That lesson is......the most difficult........of all the lesson ( difficult)

5. Our car is....older........than theirs ( old)

6. Ken is not......taller.......as my brother (tall)

7. The weathers is .....warmer.....today than is was yestesday (warm)

8 Dalat is ......further..........from here than Vungtau (far)

9 We have.....less..........difficulty with this part than the other one (little)

10 Does your country have.....badly....... weather as this? ( bad)

Câu 1 : 5406

Câu 2 : 850

Câu 3 : 20

Câu 4 : 107950000

Câu 5 : 48

Câu 6 : 60

Câu 7 : 49

Câu 8 : 3120

Câu 9 : 11

Câu 10 : 362

câu 4 107950000

1.5406

2.850

3.20

4.17950000

5.48

6.60

7.49

8.3120

9.11

10.362

Donald Trump có 19 cháu, tất cả các lứa tuổi khác nhau. Anna là người lớn tuổi nhất. Tổng số tuổi của lứa tuổi của tất cả các cháu là 190.Am là bao nhiêu tuổi Anna?

trung bình độ tuổi mỗi cháu là:

        190 :19=10 (tuổi)

trong trường hợp đen nhất mà vẫn giữ cho tuổi anna lớn nhất thì phải bớt mỗi cháu đi 1 tuổi.

vậy 18 cháu bớt 1 tuổi thì tuổi của anna là:

            10+18x1=28(tuổi)

                              đ\s:28 tuổi

Read the passage below and choose the best answer (A, B, C, D ) for each question:

Prague has the population of over one million people. It is not the biggest city in Europe, but it is certainly one of the most beautiful. People call Prague the “ Golden City” and the “Mother of City” because it has beautiful buildings and statues. Perhaps the most popular building is the Old Town Hall with its amazing 15th century clock. People also call Prague “Europe’s School of Music” . There are many concert halls and every May there is a famous music festival: ”Prague Spring” ,There are also twenty theaters and many old pubs, wine bar and restaurants. There is now a modern underground, but traffic is still a problem. It is often better to walk and feel the atmosphere of the pretty little streets.

1. The population of Prague is ………………………………….

A. over one million people B. one million people

C. only two million people D. less than one million people

2 Prague is one of the most beautiful city in……………………………………..

A. Asia B. Europe C. Africa D. America

3. Which building in Prague has 15th century clock?

A. The Golden City B. The Mother of City C. The Old Town Hall D. Europe’s School of Music

4.The famous music festival: “Prague Spring” is held ……………………………

A. every year B. on June C. every May D. every July

1.A

2.B

3.C

4.C

nhớ tick đúng cho mk nha

is that true ? I don't think Donald Trump has 19 grandchildren. How many children does Trump have ? after that I will answer your question !

At least Anna must be 10 years old