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minh100
2 năm trước

2 gương phẳng G1,G2 . Biết G1 quay quanh I1 và G2 quay quanh I2 (I1 và I2 cố định) ∠SI1I2=α;góc SI2I1 =β. Gọi 2 ảnh đầu tiên của S qua G1 và G2 là S1 và S2.Tính góc φ hợp giữa 2 mặt gương sao cho khoảng cách S1, S2 là: a. Nhỏ nhất b. Lớn nhất

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richkids
2 năm trước

Đáp án:

 nek

Giải thích các bước giải:

 

mathematics
2 năm trước

Tham khảo !






Câu hỏi trong lớp Xem thêm

Viết một đoạn văn hoàn chỉnh về lý do học tiếng Anh bằng cách đưa ra các manh mối ( ko chép mạng nhá)

3
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2 đáp án
13 giờ trước

31- Although I am poor, I always help the poor In spite of________________________________________________ 32- In spite of the bad weather , the pilot will bring the plane down safely Although___________________________________________________ 33- although the team played well, they lost Despite______________________________________________________ 34- In spite of his good salary, he was unhappy in his job In spite of_____________________________________________________ 35- in spite of his broken leg, he managed to get out of the car Although_____________________________________________________ 26- Athough she is poor, she always helps the poor Much as_____________________________________________________ 27- Although he was hard, she didn’t pass the exam Much as_____________________________________________________ 28- Although he was rich, he didn’t help the poor No matter how________________________________________________ 29- Although Peter is late, he could see the first film No matter___________________________________________________ 30. Although he isn’t rich. He isn’t happy. No matter___________________________________________________ 31. Although It was cold, he didn’t wear warm cloth No matter___________________________________________________ 32. Although his life was hard. He is determined to study well. Hard ______________________________________________________ kết thúc ;-;

3
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1 đáp án
13 giờ trước

21- in spite of his age, Mr Benson runs 8 miles before breakfast Although_________________________________________________ 22- Although she said that she would cme, I don’t think she ever will Despite__________________________________________________ 23- Although we live in the same street, we don’t know each other Although________________________________________________ 24- In spite of having little money, they are happy Although________________________________________________ 25- In spite of the silly story, I enjoyed the film Although________________________________________________ 26- Although Carol had a headache, she still read until late In spite of________________________________________________ 27- Despite the bad weather, the trip was enjoyable Although_________________________________________________ 28- Despite being poor, she lives in happiness Even though______________________________________________ 29- Despite not having the qualifications, Jane got the job Although_________________________________________________ 30- Although she was ill, she went to work Despite__________________________________________________

3
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2 đáp án
13 giờ trước

việt nam dành độc lập vào năm nào

3
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2 đáp án
13 giờ trước

Choose the best answer.

I think you should buy _____  pack of mineral water instead. And you can also buy _____  snacks such as potato crisps, 3 kilos of mandarins, 2 kilos of apples, 3 bunches of bananas, ______  cookies and soft candies.

351
351 lượt xem
1 đáp án
1 năm trước

Choose the best answer.

We should decorate our living room with _____ orange banner. We also need ________  ribbons, balloons, party hats and costume.

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271 lượt xem
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Choose the best answer.

I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.

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