giúp mình với ạ1. Cho nửa khoảng A = (−∞

TT

Thanh Tuyền

8 tháng 7 2021

giúp mình với ạ

1. Cho nửa khoảng A = (−∞; −2) và B = (-4; 3). Tìm A giao B  và B/A

2. Giải phương trình: √7x²-3x= 2x

#Toán lớp 10

1

LT

Lê Thị Thục Hiền

8 tháng 7 2021

\(1.A\cap B=\left(-4;-2\right)\)

\(B/A=\)\([-2;3)\)

\(2.\sqrt{7x^2}-3x=2x\)

\(\Leftrightarrow\sqrt{7x^2}=5x\)

\(\Leftrightarrow\left\{{}\begin{matrix}x\ge0\\7x^2=25x^2\end{matrix}\right.\)\(\Rightarrow x=0\)

Vậy...

Đúng(2)

NB

Nỗi Buồn Không Tên

27 tháng 9 2021

Giúp em gấp với ạ1. You ________ play loud music at night. The neighbors will call the police. A. mustn’t B. needn’t C. might not D. couldn’t2. It’s late. I think we ………… better go.A. had B. have C. should D. would3. Children ……………….. play on the grass.A. needn’t B. don’t have to C. must D. mustn’t4. Don’t pretend you don’t know that you……. have a valid ticket on the bus.A. have to B. must ...

Đọc tiếp

Giúp em gấp với ạ
1. You ________ play loud music at night. The neighbors will call the police.

A. mustn’t B. needn’t C. might not D. couldn’t

2. It’s late. I think we ………… better go.

A. had B. have C. should D. would

3. Children ……………….. play on the grass.

A. needn’t B. don’t have to C. must D. mustn’t

4. Don’t pretend you don’t know that you……. have a valid ticket on the bus.

A. have to B. must C. need D. should

5. You .................take photographs here. It is a restricted area.

A. have to B. mustn’t C. don’t have to D. shouldn’t

6. Everyone’s asleep. We …………………… make a noise

A. couldn’t B. mustn’t C. needn’t D. wouldn’t

7. I’m quite happy to walk. You …………………. drive me home.

A. don’t B. haven’t C. mustn’t D. needn’t

8. You _____ drink this. It is poison.

A. must B. needn't C. mustn't D. shouldn't

9. You aren’t allowed to take photographs here.

A. You needn’t take photographs here. B. You can’t take photographs here.

C. You don’t have to take photographs here. D. You mustn’t take photographs here.

10. She felt ill and _____ leave early.

A. has to B. must C. had to D. ought

11. You ___________ use your mobile phone in the examination room.

A. oughtn’t to B. mustn’t C. don’t have to D. shouldn’t

12. My grandparents live in the suburb, so whenever we visit them, we___________ a bus.

A. must take B. should take C. have to be taken D. have to take

13. “Must I take my umbrella?” - “No, you ___. It’s not going to rain.”

A. mustn’t B. have to C. needn’t D. don’t

14. The Prince’s aircraft had to undergo a security check and so we ___ to him for almost an hour. Father was very impressed as normally he could have counted on nothing more than a handshake.

A. might talk B. were able to talk C. could have talked D. may have talked

15. The book is optional. My professor said we could read it if we needed extra credit. But we ___ read it if we don't want to.

A. cannot B. don't have to C. must not D. should not

16. He…………….his job because he seems very happy.

A. would like B. can like C. will like D. must like

17. “Must you come when your neighbour calls?” – “No, I…………………..

A. must not B. mustn’t C. don’t have to D. must not come

18. You ……………… exercise regularly.

A. mustn’t B. should C. would D. needn’t

19. Young people ______ obey their parents.

A. must B. may C. will D. ought to

20. Laura, you and the kids just have dinner without waiting for me. I ______ work very hard today.

A. can B. may C. should D. would

21. I ______ be delighted to show you round the factory.

A. ought to B. would C. might D. can

22. Leave early so that you ______ miss the bus.

A. didn’t B. won’t C. shouldn’t D. mustn’t

23. Jenny's engagement ring is enormous! It ______ have cost a fortune

A. must B. might C. will D. should

24. You ______ to write them today.

A. should B. must C. had D. ought

25. If you like, we ___ volleyball with the children while the men ___ up the barbecue.

A. could play - are setting B. could have played - have set

C. will play - were setting D. can play - had been setting

26. Unless he runs he______ catch the train.

A. will B. mustn’t C. wouldn’t D. won’t

27. The lamp ___ be broken. Maybe the light bulb just burned out.

A. could not B. might not C. must not D. cannot

28. Do you always have to say the first thing that pops into your head. ___ you think once in a while before you speak?

A. Can not B. Don't C. Can't D. Why

29. "______you hand me that pair of scissors, please?"

A. May B. Will C. Shall D. Should
30. You ___ forget to pay the rent tomorrow. The landlord is very strict about paying on time.
A. couldn't B. don't have to C. mustn't D. needn’t

#Tiếng anh lớp 8

0

MN

mai ngọc linh

21 tháng 3 2022

giúp mik với ạ1. The wind, the sun, and the wave are some types of __________ sources of energy.A. changeable B. alternative C. cheap D. costly2. Remember to __________ the lights before going to bed.A. turn B. turn on C. turn off D. stop3. People will reduce energy __________ as much as possible.A. consume B. consumption C. expense D. expenses4. Nuclear power is expensive and dangerous __________ our environment.A. for B. to...

Đọc tiếp

giúp mik với ạ
1. The wind, the sun, and the wave are some types of __________ sources of energy.
A. changeable B. alternative C. cheap D. costly
2. Remember to __________ the lights before going to bed.
A. turn B. turn on C. turn off D. stop
3. People will reduce energy __________ as much as possible.
A. consume B. consumption C. expense D. expenses
4. Nuclear power is expensive and dangerous __________ our environment.
A. for B. to C. in D. with
5. Human is looking for a clean, cheap and __________ sources of energy.
A. effective B. effect C. effectively D. effectiveness
6. Low energy light bulbs should be used to __________ electricity.
A. spend B. buy C. convert D. save
7. We must __________ the amount of water our family used every day.
A. lower B. reduce C. lessen D. narrow
8. At this time next month we __________ to Ha Long Bay for a holiday.
A. will go B. will going C. will be gone D. will be going
9. By the middle of the 21st century, people in developing countries __________ more renewable energy.
A. uses B. will be using C. used D. have
10. Fossil fuels are very common in our society but they __________ the environment.
A. renew B. provide C. waste D. pollute
11. When you save energy, you not only save money, you also reduce the demand for __________ such as coal, oil, and natural gas and that is a great way to play a part in saving the planet.
A. carbon footprint B. electricity
C. fossil fuels D. biogas
12. In India, the demand for __________ has always been more than the supply.
A. shortage B. sources C. slogan D. electricity
13. __________ energy is produced by collecting sunlight and converting it into electricity.
A. Hydro B. Nuclear C. Solar D. Wind
14. There are many available __________ power sources in Vietnam including sun, wind, water, etc.
A. nuclear B. hydro C. renewable D. solar

15. Laos and Cambodia have big plans for building up to 11__________ on the lower Mekong.
A. dams B. slogans C. energy D. coals
16. __________ can be an excellent source of free, renewable energy for poor farmers.
A. Turbine B. Biogas C. Solar panel D. Bulb
17. The government has warned that Britain will face power __________ in the coming winters.
A. coal B. shortages C. slogans D. energy
18. Wind power is one of the earliest __________ sources of energy used by humankind.
A. alternative B. polluted C. harmful D. exhausted
19. Nobody can predict exactly when supplies of fossil fuels will be __________ However, we all know they quickly reduce in quantity.
A. installed B. polluted C. harmful D. exhausted
20. Biogas can be used to __________ natural gas in cooking, heating, or electrical generation.
A. use up B. replace C. pollute D. install
21. At this time next week we__________ to work to support the air pollution cutting down campaign.
A. are cycling B. will be cycling C. will cycle D. will be cycled
22. Someone’s carbon__________ is a measurement of the amount of carbon dioxide that their activities produce.
A. footprint B. energy C. effect D. amount
23. Remember to__________ the lights before going to bed.
A. turn on B. stop C. turn D. turn off
24. We will cut down in the use of natural gas because it is __________ and harmful to the environment.
A. available B. abundant C. plenty D. limited
25. Hydro power is__________ because dams cannot be built in certain areas.
A. abundant B. enough C. limited D. unlimited
26. __________ source of energy is the source that can’t be replaced after use.
A. Effective B. Non-renewable C. Renewable D. Natural
27. Which of the following is NOT renewable source of energy?
A. wind B. coal C. hydro D. solar
28. We are looking for cheap, clean and__________ sources of energy.
A. serious B. dangerous C. effective D. efficient

29. By the middle of the 21st century, people in developing countries__________ more renewable energy.
A. used B. have used C. uses D. will be using
30. If we go on__________ electricity, we will have to pay a lot next month.
A. turning on B. widened C. wasting D. increasing
31. Biogas is__________ and cheap for cooking and heating.
A. serious B. expensive C. plenty D. abundant
32. We should put__________ on our roof for the heating and hot water.
A. equipment B. cracks C. solar energy D. solar panels
33. In many countries, people think that electricity, gas and water are not luxuries but__________.
A. necessities B. appliances C. sales D. consumers
34. We should use light bulbs in our homes.
A. a bit energy B. efficient C. low energy D. little energy
35. A hydropower station__________ in the North of the country next year.
A. will be built B. has been built C. was built D. were built
36. Nuclear energy is__________, but it is dangerous.
A. renewable B. non-renewable C. natural resource D. fossil fuel
37. Fossil fuels are very common in our society but they__________ the environment.
A. waste B. pollute C. renew D. provide
38. All the houses in our village will be__________ by solar energy.
A. frozen B. widened C. heated D. heightened
39. Several governments try to__________ the use of fossil fuels.
A. waste B. save C. reduce D. increase
40. At this time next week, we__________ a wind turbine in our garden.
A. will installed B. will be installing
C. install D. installed
41. Low energy light bulbs should be used to__________ electricity.
A. convert B. save C. spend D. buy
42. It is a good idea to use__________ when travelling long distances.
A. private cars B. public transport C. cars D. taxis
43. “Why is it called a__________ source?” - “Because it can be replaced easily and quickly.”
A. renewable B. non-renewable C. effective D. specific
44. We must__________ the amount of water our family use every day.
A. lessen B. narrow C. lower D. reduce

45. Wave energy is a source of__________ energy.
A. environmental friendly B. environmentally friendliness
C. environment friendly D. environmentally friendly
46. Alternative sources of energy__________ developed in the near future.
A. has been B. will be C. is D. was
47. She__________ cooking in the kitchen at 7 PM tomorrow.
A. will B. is C. will be D. be
48. Some new energy-saving bulbs__________ in the dining room.
A. will be put B. will put be C. will put D. will be putting
49. What should we do to electricity?
A. take B. save C. cut D. waste
50. The wind, the sun, and the wave are some types of __________ sources of energy.
A. cheap B. costly C. changeable D. alternative

#Tiếng anh lớp 7

1

LT

Lê Trang

21 tháng 3 2022

1. The wind, the sun, and the wave are some types of __________ sources of energy.
A. changeable B. alternative C. cheap D. costly
2. Remember to __________ the lights before going to bed.
A. turn B. turn on C. turn off D. stop
3. People will reduce energy __________ as much as possible.
A. consume B. consumption C. expense D. expenses
4. Nuclear power is expensive and dangerous __________ our environment.
A. for B. to C. in D. with
5. Human is looking for a clean, cheap and __________ sources of energy.
A. effective B. effect C. effectively D. effectiveness
6. Low energy light bulbs should be used to __________ electricity.
A. spend B. buy C. convert D. save
7. We must __________ the amount of water our family used every day.
A. lower B. reduce C. lessen D. narrow
8. At this time next month we __________ to Ha Long Bay for a holiday.
A. will go B. will going C. will be gone D. will be going
9. By the middle of the 21st century, people in developing countries __________ more renewable energy.
A. uses B. will be using C. used D. have
10. Fossil fuels are very common in our society but they __________ the environment.
A. renew B. provide C. waste D. pollute
11. When you save energy, you not only save money, you also reduce the demand for __________ such as coal, oil, and natural gas and that is a great way to play a part in saving the planet.
A. carbon footprint B. electricity
C. fossil fuels D. biogas
12. In India, the demand for __________ has always been more than the supply.
A. shortage B. sources C. slogan D. electricity
13. __________ energy is produced by collecting sunlight and converting it into electricity.
A. Hydro B. Nuclear C. Solar D. Wind
14. There are many available __________ power sources in Vietnam including sun, wind, water, etc.
A. nuclear B. hydro C. renewable D. solar

15. Laos and Cambodia have big plans for building up to 11__________ on the lower Mekong.
A. dams B. slogans C. energy D. coals
16. __________ can be an excellent source of free, renewable energy for poor farmers.
A. Turbine B. Biogas C. Solar panel D. Bulb
17. The government has warned that Britain will face power __________ in the coming winters.
A. coal B. shortages C. slogans D. energy
18. Wind power is one of the earliest __________ sources of energy used by humankind.
A. alternative B. polluted C. harmful D. exhausted
19. Nobody can predict exactly when supplies of fossil fuels will be __________ However, we all know they quickly reduce in quantity.
A. installed B. polluted C. harmful D. exhausted
20. Biogas can be used to __________ natural gas in cooking, heating, or electrical generation.
A. use up B. replace C. pollute D. install
21. At this time next week we__________ to work to support the air pollution cutting down campaign.
A. are cycling B. will be cycling C. will cycle D. will be cycled
22. Someone’s carbon__________ is a measurement of the amount of carbon dioxide that their activities produce.
A. footprint B. energy C. effect D. amount
23. Remember to__________ the lights before going to bed.
A. turn on B. stop C. turn D. turn off
24. We will cut down in the use of natural gas because it is __________ and harmful to the environment.
A. available B. abundant C. plenty D. limited
25. Hydro power is__________ because dams cannot be built in certain areas.
A. abundant B. enough C. limited D. unlimited
26. __________ source of energy is the source that can’t be replaced after use.
A. Effective B. Non-renewable C. Renewable D. Natural
27. Which of the following is NOT renewable source of energy?
A. wind B. coal C. hydro D. solar
28. We are looking for cheap, clean and__________ sources of energy.
A. serious B. dangerous C. effective D. efficient

29. By the middle of the 21st century, people in developing countries__________ more renewable energy.
A. used B. have used C. uses D. will be using
30. If we go on__________ electricity, we will have to pay a lot next month.
A. turning on B. widened C. wasting D. increasing
31. Biogas is__________ and cheap for cooking and heating.
A. serious B. expensive C. plenty D. abundant
32. We should put__________ on our roof for the heating and hot water.
A. equipment B. cracks C. solar energy D. solar panels
33. In many countries, people think that electricity, gas and water are not luxuries but__________.
A. necessities B. appliances C. sales D. consumers
34. We should use light bulbs in our homes.
A. a bit energy B. efficient C. low energy D. little energy
35. A hydropower station__________ in the North of the country next year.
A. will be built B. has been built C. was built D. were built
36. Nuclear energy is__________, but it is dangerous.
A. renewable B. non-renewable C. natural resource D. fossil fuel
37. Fossil fuels are very common in our society but they__________ the environment.
A. waste B. pollute C. renew D. provide
38. All the houses in our village will be__________ by solar energy.
A. frozen B. widened C. heated D. heightened
39. Several governments try to__________ the use of fossil fuels.
A. waste B. save C. reduce D. increase
40. At this time next week, we__________ a wind turbine in our garden.
A. will installed B. will be installing
C. install D. installed
41. Low energy light bulbs should be used to__________ electricity.
A. convert B. save C. spend D. buy
42. It is a good idea to use__________ when travelling long distances.
A. private cars B. public transport C. cars D. taxis
43. “Why is it called a__________ source?” - “Because it can be replaced easily and quickly.”
A. renewable B. non-renewable C. effective D. specific
44. We must__________ the amount of water our family use every day.
A. lessen B. narrow C. lower D. reduce
45. Wave energy is a source of__________ energy.
A. environmental friendly B. environmentally friendliness
C. environment friendly D. environmentally friendly
46. Alternative sources of energy__________ developed in the near future.
A. has been B. will be C. is D. was
47. She__________ cooking in the kitchen at 7 PM tomorrow.
A. will B. is C. will be D. be
48. Some new energy-saving bulbs__________ in the dining room.
A. will be put B. will put be C. will put D. will be putting
49. What should we do to electricity?
A. take B. save C. cut D. waste
50. The wind, the sun, and the wave are some types of __________ sources of energy.
A. cheap B. costly C. changeable D. alternative

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TB

tran bao uyen nhi

21 tháng 12 2016

92573+24762=?

giúp mình với mình giúp lại cho!

#Toán lớp 4

12

KM

Karry Miu

21 tháng 12 2016

92573 + 24762 = 117335

Đúng(0)

MK

Ma Kết tài năng

21 tháng 12 2016

92573 + 24762 = 120035

Đúng(0)

ND

Nguyễn Đức Duy

15 tháng 9 2023

điền ô trống cho mình với: 1,...,4,...16,...,32.

các bạn trả lời giúp mình với

#Toán lớp 3

5

NT

Nguyễn Thị Tâm

15 tháng 9 2023

2,8,16 ☺

Đúng(4)

DT

Đoàn Trần Quỳnh Hương

15 tháng 9 2023

Số cần điền là: 2 ; 8

Quy luật: Số liền trước nhân với 2 sẽ ra số liền sau

Ví dụ: 1 x 2 = 2

2 x 2 = 4

4 x 2 = 8

8 x 2 = 16

16 x 2 = 32

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NN

Nhung Nguyen

19 tháng 12 2022

56083 : 123 =?
Ai giải nhanh giúp mình với ạ
Tính hàng dọc giúp mình với (đặt tính)

#Toán lớp 4

1

NK

Ng KimAnhh

19 tháng 12 2022

56083 | 123

688 | 455

733 |

118

=> \(56083:123=455\left(dư.118\right)\)

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C1

C09-10 Dương Thị Thu Hiền

11 tháng 1 2022

Mn giúp mình bài này với á. Chỉ chi tiết cách làm từng câu cho mình với ạ.

#Tiếng anh lớp 10

0

TT

Thủyy Tiênn

2 tháng 12 2016

Cho a, b biết a và 2 tỉ lệ thuận với 3 và b; 3 và b tỉ lệ thuận với b-1 và a. Tìm a,b.

Các ơi giúp mình với mai mình phải nộp đề cương rồi

#Toán lớp 7

0

NH

Nguyễn Hân

29 tháng 11 2017

Cho A=(3n+2015)(3n+2016) với n€N. Hãy chứng minh A chia hết cho 2.

Giúp mình với.

#Toán lớp 6

0

TP

Trần Phương (N.R)

4 tháng 2 2017

2a/x+a=1

Giúp mình với mình cần gấp

#Toán lớp 8

1

DD

Đinh Đức Hùng

4 tháng 2 2017

\(\frac{2a}{x+a}=1\)

2a = x + a

a + a = x + a

=> a = x

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