Câu 22.Khi mặt trời chiếu vào một cây cao 13 m trồng trên một mặt đất phẳng thi bóng trên mặt đất của cây đó dài 5m. Hỏi tia sáng mặt trời chiếu vào đỉnh cây tạo với mặt đất một góc a bằng bao nhiêu? (làm tròn đến độ) A. a ≈ 70°. B. a ≈ 60°. C. a ≈ 69°. D. a ≈ 68. 20 điểm + câu trả lời hay nhất + cảm ơn

Bài III (3,0 điểm): Cho tam giác ABC vuông tại A, phân giác BD (D thuộc AC). Trên BC lấy điểm E sao cho BE = AB. Gọi M là giao điểm của đường thẳng ED và đường thắng BA. 1) Chứng minh tam giác ABD = tam giác EBD. 2) Chứng minh tam giác ADE là tam giác cân. 3) So sánh EC và DM. 4) Tính độ đài đoạn thắng BD khi AC = 6cm và góc ACB = 30° Giúp mik vs ạ ! Cảm ơn các bạn !

1. “I stole his bicycle”, he said to the police.(admit) 2. "Fill in the form, Sir," the receptionist said. 3. “Let’s sing a happy birthday song!” They said 37. “Look at the picture and answer my questions, please!” My teacher said to us. My teacher told to us 4. “Can you play volleyball well?” She asked me She asked me if 5. “Are you a boy or a girl?” They asked me They asked me iif I 6. “Look and read right now” He shouted at me 7. “Let’s visit our old form teacher!” he said. 8.“Shall we have lunch together?” She said 9.”Yes, all right, I will lend you some money.” Ann said to me. 10.”Shall I make you some tea?” Nam said to his girlfriend.

Tìm x,y biết: 1/x^2+20+9y^2+8x-12y=0 2/x^2+9y^2-12y+29-10x=0

giải hộ mk vs ạ sắp nộp rồi mn ơi

Fill in each gap with one suitable word to complete the passage. England is not a large (1)_______________. No town (2)______________England is very far (3)______________the sea and many English families spend their summer holidays at (4)______________seasides. There are no high mountains in England, no very (5)______________rivers and no very large forests. There (6)___________many towns in England. No town is far from another. The English countryside between the towns is like the carpet of many (7)______________. In (8)______________and summer, the fields, meadows and forests (9)_____________ light green or dark green and the gardens are green, red, blue, yellow and white (10)_________________ flowers.

Vẽ đậu mầm đag ngồi ngắm cảnh hộ mình NL: Nghỉ hè đối với mình rất chán kiểu ko có việc gì làm. Còn các bạn thì sao?

Ở trường A đầu năm số học sinh nữ bằng 4/5 số học sinh nam. Cuối học kì 1 trường nhận thêm 20 học sinh nữ và giảm 5 học sinh nam, nên số học sinh nữ lúc này chiếm bằng tổng số học sinh cả trường. Hỏi đầu năm học trường đó có bao nhiêu học sinh? giúp mình bài này với mình đang cần gấp ạ

Ôxi hoá hoàn toàn 16,8 gam hỗn hợp gồm hai kim loại X, Y thu được 50,8 gam hỗn hợp Z gồm hai oxit . Hoà tan hoàn toàn Z bằng một lượng vừa đủ dung dịch H2SO4 24,5 % ( d= 1,25 gam/ml). Tính VddH2S04 = ? ................................

I. Combine each pair of these sentences, using a relative pronoun or adverb 1. The university accepts a few students each year with a low grade-point average. This is lucky for Mike. 2.Jerry is engaged in several business ventures. Only one of them is profitable. 3. Five students will be awarded a present. Their test results are excellent. 4. The greyhound is the fastest dog. It can reach speeds of over 65 kilometres. 5. The talk was attended by a large audience. None of them left before the end. 6. Venus is a very hot place. It is much closer to the Sun than the Earth is. 7. . I’ve lost touch with most of my ex-classmates. Many of them went abroad to study. 8. The singer had very little money when he died. That surprised everyone. 9. The football team has won all their matches this season, and their manager is a famous Spanish footballer. 10. Cricket is popular in many countries around the world. It is played between two teams of eleven 11. I spoke to Mr. and Mrs. Gibbs only last week just before they died in that terrible train accident. 12. They picked up five boat-loads of refugees. Some of them had been at sea for several months. 13. Ms. Thompson will be our History teacher next semester. You talked with her yesterday 14. Astronomers observed a large number of meteorites. Few of them reached the ground. 15. . Tuan has just won the second prize in the English contest. Tuan’s uncle is a pilot. 16. He never forgets the year 1982. His company went bankrupt in 1982. 17. The scientist won the Nobel Prize for his groundbreaking work. Most of his work was on genomes. 18 I never forget the park. We met each other for the first time at this park. mọi người giúp em vs ạaa