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2 tháng 12 2018

Bạn ghi cho đúng môn học nhé !

1) ABCD là HBH thì:

\(\overrightarrow{AB}=\overrightarrow{DC}\)\(\Leftrightarrow\) \(\left(1;-5\right)=\left(-2-x_D;1-y_D\right)\)

\(\Leftrightarrow\) \(\hept{\begin{cases}-2-x_D=1\\1-y_D=-5\end{cases}}\)\(\Leftrightarrow\) \(\hept{\begin{cases}x_D=-3\\y_D=6\end{cases}}\)

2) Bạn chuyển hết vế phải qua vế trái

Xác định tọa độ các vecto MA MB MC (nhân với các hệ số tương ứng)

thì ta có được hpt:

\(\hept{\begin{cases}x_{MA}-2x_{MB}+x_{MC}=0\\y_{MA}-2y_{MB}+y_{MC}=0\end{cases}}\)

Bạn tự làm tiếp nhé

2 tháng 12 2018

Mình cảm ơn

2 tháng 8 2021

Dương Thanh Ngân ơi, câu này môn Toán em hãy đăng vào box Toán để nhận được sự hỗ trợ nhanh chóng nhé!

29 tháng 10 2016

1. Winning the football pools enabled us to buy a new car.

2.There is no use in calling Kim, because his phone is out of order.

3. The decorators managed not to make too much mess.

4. When is the last time you have a haircut?

5. I derive pleasure from collecting stamps.

6. Don't put off going to dentist's.

9 tháng 11 2018

Rewrite the sentences without changing their meanings :

1. Would you please do it for me ?

⇒⇒ Would you mind doing it for me ?

2. She doesn't usually stay up so late .

⇒⇒ She is not used to staying up so late .

3. The children like going in the rain .

⇒⇒ The children enjoy going in the rain .

4. Why don't we go out for a meal tonight ?

⇒⇒ I suggest going out for a meal tonight

5. It took her 2 hours to drive from London to Edingburgh .

⇒⇒ She spent 2 hours driving from London to Edingburgh

6. This is the first time he has gone abroad .

⇒⇒ He hasn't gone abroad before

7. She started driving one months ago .

⇒⇒ She has driven for one month

8. We began eating when it started to rain .

⇒⇒ We have eaten since it started to rain .

9. I last had my hair cut when I left her .

⇒⇒ I haven't had hair cut since I left her .

10. The last time she kissed me was 5 months ago .

⇒⇒ She hasn't kissed me for 5 months

11. It is a long time since we last met .

⇒⇒ We haven't met for a long time

12. When did you have it ?

⇒⇒ How long have you had it

14 tháng 4 2019

1. _____ greatest invention of the 20th century is the computer.

A. θθ

B. the

C. a

D. an

2. Make sure you put your name at _____ end of the report.

A. θθ

B. a

C. an

D. the

3. We need to do more for ___ poor.

A. θθ

B. the

C. a

D. an

4. I saw ____ man going into the office. I don't know who ___ man was.

A. θθ / the

B. the / a

C. a / the

D. a / a

5. Milk is often added to___ tea in_____UK.

A. a / a

B. a / θθ

C. θθ / the

D. θθ / θ

21 tháng 10 2018

Put the words in the correct order to make meaningful sentences .

1/ new / language center / a / has / city / built / in / been / the .

⇒A new language center has been built in the city

2/ and / more / trees / more / have / for / cut / been / down / woods .

⇒More and more trees have been cut down for woods

3. than / one / more / the / hundred / and / houses / buildings / have / damaged / been / in / earthquake .

⇒ More than one hundred houses and buildings have been damaged in the earthquake

4. has / second / just / finished / she / her / novel .

⇒She has just finished her second novel

5. of / animals / have / fire / thousands / been / in / the / killed / forest .

thousands of animals have killed of fire in the forest

21 tháng 10 2018

Put the words in the correct order to make meaningful sentences .

1/ new / language center / a / has / city / built / in / been / the .

⇒⇒ A new language center has been built in the city.

2/ and / more / trees / more / have / for / cut / been / down / woods .

⇒⇒ More and more trees have been cut down for woods.

3. than / one / more / the / hundred / and / houses / buildings / have / damaged / been / in / earthquake .

⇒⇒ More than one hundred houses and buidings have been damaged in the earthquake.

4. has / second / just / finished / she / her / novel .

⇒⇒ She has just finished her second novel.

5. of / animals / have / fire / thousands / been / in / the / killed / forest .

⇒⇒ Thousands of animals have been killed in the forest fire.

3 tháng 10 2017

Exercise 5: Hoàn thành các câu sau:

1.(he/drive to word every day)

→ He drives to work everyday.

2.(I/ not /think you're right)

→→ I don't think you're right.

3.(we/have enough time?)

→ Do we have enough time?

4.(I/eat cereal in the morning)

→I eat cereal in the morning.

5.(they / write e-mails every day?)

→→ Do they write e-mails everyday?

6.(you/ watch a lot of TV)

→ You watch a lot of TV.

7.(he/not/read the newspaper)

→→He doesn't read the newspaper

8.(she/dance often ?)

→ Does she dance often?

9.(where/I/come on mondays?)

→→ Where do I come on Mondays?

10.(what/you/do at the weekend?)

→→ What do you do at the weekend?

11.(you/not/drink much tea )

→You don't drink too much tea.

12.(how/he/travel to work ?)

→→How does he travel to work?

13.(they/not/like vegetables)

→→They don't like vegetables.

14.(she/catch acold every winter)

→→She catches a cold every winter.

15.(I/go uot often? )

→Do I go out often?

16.(you/speak English?)

→→Do you speak English?

17.(we/take the bus often)

→→We take the bus often.

18.(she/not/walk to school)

→She doesn't walk to school.

19.(what/you/buy in the supermarket?)

→→What do you buy in the supermarket?

20.(how/he/ carry such a heavy bag?)

→How does he carry such a heavy bag?

3 tháng 10 2017

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