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Anh Thư
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Nguyễn Lê Phước Thịnh
21 tháng 3 2023 lúc 18:33

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Lương Minh THảo
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Phùng Tuệ Minh
4 tháng 4 2019 lúc 14:08

Q10 là 10.Q????
1) Ta có: \(\frac{n+3}{2n-2}\)\(=\frac{n+3}{2\left(n-1\right)}\)

Để \(\frac{n+3}{2\left(n-1\right)}\in Z\) thì \(\left\{{}\begin{matrix}n+3\in Z\Rightarrow n\in Z\\2\left(n-1\right)\in Z\Rightarrow n\in Z\\2\left(n-1\right)\ne0\Rightarrow n-1\ne0\Rightarrow n\ne1\end{matrix}\right.\)

Vậy để \(\frac{n+3}{2n-2}\in Z\) thì: \(n\in Z;n\ne1\)

mà n là số tự nhiên \(\Rightarrow n\in N;n\ne1\)

Vậy: Để \(\frac{n+3}{2n-2}\in Z\) thì: n\(\in N;n\ne1\)

2) Ta có: \(Q=\frac{1}{5.6}+\frac{1}{6.7}+\frac{1}{7.8}+\frac{1}{8.9}+\frac{1}{9.10}\)

\(\Leftrightarrow Q=\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+...+\frac{1}{9}-\frac{1}{10}\)

\(\Leftrightarrow Q=\frac{1}{5}-\frac{1}{10}=\frac{1}{10}\)

\(\Leftrightarrow10.Q=10.\frac{1}{10}=1\)

Lương Minh THảo
6 tháng 2 2017 lúc 19:07

ko ai lm đc ạ???? .-.

Daidouji
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Daidouji
22 tháng 8 2017 lúc 11:19

hình đẹp ấy nhỉ

Image result for smiley face

Lê Phạm Quỳnh Nga
22 tháng 8 2017 lúc 11:22

cách để dăng hình dễ mà, chỉ cần sao chép thôi, nè:

Hình ảnh có liên quan

Trinh Duy Duong
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Lạc Dao Dao
29 tháng 4 2020 lúc 22:20

Q1 :Odd one out

city

village

town

hospital

Q2: Odd one out

cough

weak

headache

sore throat

Q3 : Odd one out

feel

heathy

well

tired

Q4 : Odd one out

night

hospital

school

airport

Q5 :Odd one out

tired

scared

cupboard

sad

Q6 : Fill in blank : Where..... he go last summer?

did

do

does

was

Q7 : Answer the question : What's the matter with you?

I went to the hospital.

I have a sore throat.

You should go to the doctor.

Phong has a fever.

Q8 : Fill in blank : I went there by ............

stadium

how

big

train

Q9 : Fill in blank : Trung had a .......last week. He could'nt speak.

sore throat

backache

fever

headache

Q10 :Answer the question : when did your family move to the new house?

Last week.

With my mother.

At home. 

 By car.

Read and answer the questions.
Hello, my name is Hoa. I’d to be a teacher in the future. I’d to teach children to read, write, do math, and much more. I’d to try to make my lessons easy to understand. I’d to make posters or worksheets, use games, videos, computers, a chalkboard, a projector and other tools to teach children different subjects. When students don’t do well, I’d to help them. I am studying hard at my school. I hope my dream wil be true someday.

Q16 :What is her name?

Her name ís Hoa

Q17 :What would she to be in the future?

She'd  to be a teacher

Q18 :Why would she to make posters or worksheets, use games, videos, computers, a chalkboard, a projector and other tools ?

Beacause she wants to help the students

Q19 :Is she studying hard at school ?

Yes, she is

Học tốt

 

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Ngọc ツ
30 tháng 4 2020 lúc 14:05

Q1 :Odd one out

1 điểm

city

village

town

hospital

Q2: Odd one out

1 điểm

cough

weak

headache

sore throat

Q3 : Odd one out

1 điểm

feel

heathy

well

tired

Q4 : Odd one out

1 điểm

night

hospital

school

airport

Q5 :Odd one out

1 điểm

tired

scared

cupboard

sad

Q6 : Fill in blank : Where..... he go last summer?

1 điểm

did

do

does

was

Q7 : Answer the question : What's the matter with you?

1 điểm

I went to the hospital.

I have a sore throat.

You should go to the doctor.

Phong has a fever.

Q8 : Fill in blank : I went there by ............

1 điểm

stadium

how

big

train

Q9 : Fill in blank : Trung had a .......last week. He could'nt speak.

1 điểm

sore throat

backache

fever

headache

Q10 :Answer the question : when did your family move to the new house?

1 điểm

Last week.

With my mother.

At home.

By car.

Read and answer the questions.
Hello, my name is Hoa. I’d to be a teacher in the future. I’d to teach children to read, write, do math, and much more. I’d to try to make my lessons easy to understand. I’d to make posters or worksheets, use games, videos, computers, a chalkboard, a projector and other tools to teach children different subjects. When students don’t do well, I’d to help them. I am studying hard at my school. I hope my dream wil be true someday.

Q16 :What is her name?

Her name is Hoa .

Q17 :What would she to be in the future?

She'd to be a teacher in the future.

Q18 :Why would she to make posters or worksheets, use games, videos, computers, a chalkboard, a projector and other tools ?

Because she wants to help her students.

Q19 :Is she studying hard at school ?

Yes , she is.

Học tốt ~!

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Ngân Thanh Lê
Xem chi tiết
B.Trâm
4 tháng 3 2020 lúc 18:04

Q1: Find the word with different stress

1 festival

2 cultural

3 traditional

4 local

Q2: Find the word with different stress

1 horror

2 highlight

3 perform

4 seasonal

Q3: The child always needs to ....... a helmet when riding with you.

1 wear

2 put

3 bring

4 pick

Q4: It ............ me 15 minutes to walk home from the train station.

1 used to

2 spent

3 took

4 got

Q5: Mai/use/cycle/school/when/she/grade 6/./ ........................Mai used to cycle to school when she was in grade 6 .................................................

Q6: You/must/obey/ traffic rules/ your safety/./ ..........................................You must obey traffic rules for your own safety ..............................

Q7: they/use/go/beach/every summer/?/ ....................................Did they use to go to the beach every summer?.............................................

Q8: I enjoyed the film on TV yesterday morning. Nobody in my family liked it. (although)

.....................................Although nobody in my family liked it, I enjoyed the film on TV yesterday morning..............................

Q9: He suffers from physical handicap. He has become a successful businessman. ( in spite of)

........................................In spite of suffering from physical hadicap, he has become a successful businessman.................................

Q10: The Flower Festival is celebrated every year. ( Make a question for the parts "every year")

....................................When is The Flower Festival celebrated ?.................................

Q11: We always have turkey on Thanksgiving. ( Make a question for the part "turkey").

......................................What do you always have on Thanksgiving?.........................................

Q12: Peter went to Da Nang last month with his parents. ( Make a question for the parts " his parents")

.................................Who did Peter go to Da Nang last month with?.............................

Q13: People organize this festival to pray for better crops. ( Make a question for the parts " to pray for better crops") .....................................Why do people organize this festival?........................................

Q14: Van had a motorbike once, but he doesn't any more. ( used) ..............................................Van used to have a moterbike ...................................

Q15: Last night, I didn't go to bed early .......... being very tired.

1 despite of

2 in spite of

3 although

4 because

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Đỗ Thị Thùy Trang
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Chippy Linh
28 tháng 1 2018 lúc 15:54

Choose the word or phrase ( A,B,C or D ) that best completes each sentence.

Q1. Joe didn't get a promotion because he didn't see _____ with the boss on many things

A. eye to eye B. his eyes C. from eye to eye D. eyes

Q2. Quite a few students have complained to the school _____ the course

A. about B. to C. on D. with

Q3. _____ taking an extra course next semester ? It's essential

A. Did you consider B. Have you considered C. Are you considering D. Had you considered

Q4. The students were _____ until they got the exam

A. on edge B. under edge C. in edge D. over edge

Q5. All _____ was very interesting. I am surprised you didn't like it

A. of the books B. of books C. of the book D. of book

Q6. I wonder whether you still have _____ for the position of executive manager

A. a vacancy B. job C. a post D. a vacant work

Q7. There are several candidates for the position, _____ is extremely qualified

A. each one of them B. and each one of whom C. and each one of them D. who

Q8. With his excellent qualifications and a good command of English, James is _____ above the other applicants

A. head and hair B. head and ears C. head and hands D. head and shoulders

Q9. So far, the company has refused to play ball, __preffering___ to remain independent

Q10. The robbers were _____ to two years in jail

A. sentenced B. sent C. put D. ordered

Q11. Wild animals _____ the river bank at night and traps are set to catch them

A. frequent B. attend C. go D. arrive

Q12. He built up a sucessful business but it was all done _____ of his health

A. at the expense B. at the cost C. at the sake D. by the expense

Q13. Surely you _____ responsible for a mistake that was nothing to do with you

A. can't be held B. must be C. can't take D. don't have to take

Q14. We regret to inform you that your application has been ______

A. objected to B. turned down C. handed in D. refused

Q15. Tom is difficult to work with; he tends to _____ easily

A. lose his character B. get impressed C. keep calm D. lose his temper

Ngân Thanh Lê
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Ngân Thanh Lê
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Trần Dương An Miên
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