Bài 1: Cho tam giác ABC vuông tại A, AC=3cm, BC=5cm. a, Tính AB? b, Trên tia đối của tia CA và tia CB theo thứ tự lấy 2 điểm E và D, sao cho CE=2,5cm và DC=1,5cm. Chứng minh rằng ED vuông góc vs BC và tính DE c, Gọi H là hình chiếu của A trên BC. Tính BH, CH và AH LƯU Ý: vẽ hình kèm theo, hứa vote 5sao

Ai giải thích giúp mik là sao ngay bước đầu tiên họ đưa vào căn đc v ?, Mik nhớ là phải bình phương lên r mới đưa vào đc mà nhỉ

cho mik hỏi : trường sa và hoàng sa huộc vùng biển nào vậy? đúng cho hn

Làm giúp 10 11 nha Tôi sẽ cho 5 sao

Choose the best answer to complete each of the following sentences Mn giúp em với ạ!

ghi đáp án thôi nhaaaaaaaaaaaaaaaaaaaaa nhanh vs ạ

Correct the sentences (Participial Phrase) 11. Believing that his last hour had come, his hands began to tremble. 12. Passing under a ladder, a pot of paint fell on my head. 13. Reading in bed, my hands often get very cold. 14. Leaving the cinema, it seemed to him that the film had been exceptionally bad. 15. Barking furiously, I led the dog out of the room. 16. Having paid my taxes, the amount left in the bank is hardly worth mentioning. 17. Writing my name in the hotel register, a familiar voice attracted my attention. 18. Tied to a post, the sea was tossing the boat up and down. 19. Misunderstanding the question, the wrong answer was sent in. 20. Shining in the sky, we saw the first star.

căn 20 - 3 căn 18 - căn 45 + căn 72.Giúp mik vs

Cần pha thêm bao nhiêu lít nước sôi vào 15 lít nước lạnh ở 24oC để thu được nước ở 38oC?

VI. Read the passage and choose the letter A, B, C or D to answer these following questions Dear Shirley, You won’t believe what Jack and I did last weekend! We went to Cancun! We got there early Friday morning, checked in, and went straight to the beach. We went scuba diving all morning, and we relaxed on the beach and swam all afternoon. On Saturday, we went to Tulum, the Mayan ruins about two hours south of Cancun. On Sunday, we rented a sailboat and went sailing. And then we went parasailing on the beach. It was a lot of fun! As soon as I came down from parasailing, we had to run to the hotel, check out, and get to the airport. We slept all the way home, but what wonderful three days!\n Love, Beth 41 What was the letter written about? a. A business trip b. A school trip c. A trip to Cancun d. A trip to Tulum 42 The word ‘got’ in line 1 could be replaced by which of the following? a. bought b. arrived c. took d. became 43 What does ‘as soon as’ in line 5 mean? a. Before b. When c. If d. On time 44 Jack and Beth didn’t go ______. a. scuba diving b. sailing c. sightseeing d. skiing 45 How was the trip? a. It was terrible b. It was awful c. It was great d. a & b are correct VII. Choose the word or phrase (A, B, c or D) that best fits the blank space in the following passage? Harvest Festival is (1)_____ October. It is a very ancient (2) _____, but it is also part of the Christian tradition. It (3) _____ new crops and food. Children often bring fruit, vegetables and cereals into school. Schools usually give the food to hospitals or to old people. (4) _____ the past, people sometimes (5) _____ traditional dolls out of corn. 46a. in b. at c. on d. from 47a. thing b. festival c. vacation d. holiday 48a. gives b. supplies c. celebrates d. holds 49a. In b. At c. On d. Since 50a. make b. made c. making d. are making