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Câu hỏi:

Cho góc xOy có tia phân giác là Ot. Từ M thuộc Ot vẽ MH vuông góc với Ox tại H và MK vuông góc với Oy tại K. Chứng minh: MO là tia phân giác góc HMK.

Câu trả lời của bạn: 12:29 08/12/2024

Xét tam giác HOM và tam giác KOM có:

OM chung

Góc MKO= góc MHO (= 90 độ)

GÓc HOM= góc KOM ( gt)

=> Tam giác HOM= tam giác KOM ( ch.gn )

=> Góc HMO = góc KMO ( cặp góc tương ứng )

Ta lại có: Ot là tai phân giác góc xOy

Vậy MO là tia phân giác góc HMK

Câu hỏi:

1+1=?

Câu trả lời của bạn: 21:10 04/08/2024

1+1=2

Câu hỏi:

Tính bằng cách thuận tiện
125 × 6 × 8 ×5

Câu trả lời của bạn: 21:33 17/01/2024

125 x 6 x 8 x 5=(125 x 8) x (6 x 5)=1000 x 30=30000

Câu hỏi:

Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to the following question.
A good night’s sleep is important for our health as a good diet and exercising. However, modern complex lives are making it harder and harder to sleep at normal times and to sleep well.
One of the biggest negative health effects is that people who do not sleep well are likely to gain weight. This is because people who sleep less tend to eat more due to their tiredness and need for more energy. When we do not get enough sleep, our bodies produce higher levels of hormone ghrelin which leads to people consuming more. Simultaneously, we do not have enough of the hormone leptin – it tells us when to stop eating.
In addition to weight gain, poor sleepers are also at a much higher risk of various other serious illnesses and diseases. Firstly, people who sleep less than seven to eight hours per night experience an increased risk of a heart attack. In one study, reducing sleep to four hours per night for just six nights led to the people developing pre-diabetes symptoms. Sleep is also important for a boost in our immune system and helps in the process of recovery from minor illnesses.
As well as affecting people physically, extreme tiredness, or fatigue, can have severe negative mental effects. Bad sleep, tiredness, and fatigue also cause, and be a symptom of, depression. Moreover, our mental health depends on our social groups and interacting with other people. Indeed, we cannot judge how people feel and how we react when we are tired.
All of these effects show how sleep, or lack of sleep, can change people’s lives. Besides, they have an impact on society as a whole. When it comes to work and education, we are much more likely to make a mistake at work or during school when we have poor-quality sleep. In some jobs, this may cause an injury or even result in people dying.
(Adapted from Skillful Reading and Writing 2 by Macmillan Education)

Câu 22 | #12839178 Báo lỗi
What can be inferred from the passage?

A
People who sleep well are at a higher risk of heart attack.

B
People who sleep well are more likely to make mistakes.

C
Good sleep has a positive effect on our memory performance.

D
Lack of sleep could lead to serious medical conditions.

Câu trả lời của bạn: 21:30 17/01/2024

1.C

2.D

Câu hỏi:

15.(-3)2x+1-(-3)2=86-4.53

Giải giúp mik vs!!

Câu trả lời của bạn: 21:21 17/01/2024

15.(-3)^2x+1-(-3)^2=84-4.5^4

ĐÂY là đề đúng nhé

Câu hỏi:

Ba thửa ruộng thu hoạch đc tất cả 472kg thóc Thửa 1 và thửa 2 thu hoạch đc 290kg thóc .Thửa 2 và thửa 3 thu hoạch đc 336kg thóc.Hỏi mỗi thửa thu hoạch đc bn kg thóc
chỉ mik với😭😭

Câu trả lời của bạn: 21:08 30/12/2023

Thửa 3 thu hoạch được số kg thóc là: 472-290=182 (kg)

Thửa 1 thu hoạch được số kg thóc là: 472-336=136 (kg)

Thửa 2 thu hoạch được số kg thóc là: 472-(182+136)=154 (kg)

Đáp số: thửa 1 136 kg; thửa 2 154 kg; thửa 3 182 kg.

Câu hỏi:

A.helped B.donated C.washed D.laughed

Câu trả lời của bạn: 22:06 09/12/2023

Phát âm "ed" hả bạn?

A.helped B.donated C.washed D.laughed

Đáp án: B.donated

Vì /ed/ phát âm là /id/ còn lại là âm /t/.

Câu hỏi:

22. you/Do/music/today/have/?

23. she/Can/the/play/piano/?

24. have/on/I/english/monday/wednesday/and/.

25. can/He/and/swim/football/play/.

26. are/they/doing/What/?

27. subjects/do/have/today/What/you/?

28. do/have/When/they/science/?

Câu trả lời của bạn: 21:59 09/12/2023

22. Do you have music today?

23. Can she play the piano?

24. I have english on monday and wednesday.

25. He can play football and swim.

26. What are they doing?

27. What subjects do you have today?

28. When do they have science?

Câu hỏi:

Nga and Lan______at home now(be/not)

Câu trả lời của bạn: 21:53 09/12/2023

Nga and Lan aren't at home now.

Câu hỏi:

thereissomeandmilkinthefrige

Câu trả lời của bạn: 21:45 09/12/2023

There is some milk in the fridge.

Hongle