Hình vuông ABCD có cạnh 6cm. Các cạnh hình vuông là đường kính của bốn nửa hình tròn. Tính diện tích bông hoa bốn cánh. GIÚP EM VỚI MAI NỘP BÀI RỒI!! HUHU

Đề hidro hóa isopentan trong điều kiện thích hợp có thể thu được bao nhiêu anken. Có thể giải chi tiết giúp mình k ạ? Mình chỉ biết nếu tách H từ C5H12 thì ra C5H10 thôi ạ. Có phải nta hỏi các đồng phân của C5H10 k???

Cho hình vuông ABCD có cạnh bằng 12 cm. Trên đoạn BD lấy điểm E và F sao cho BE = EF = FD. Tính diện tích hình AECF?

Giúp em với 10-2.(4-3x)=-4

Giúp mk vs ạ càng nhanh càng tốt ạ . Cảm ơn mọi người nhiều

Cho a = -20 ; b-c = -5, hãy tìm A biết A^2 = b(a-c) - c( a-b) giúp mk với ạ, mk gấp lắm !

Bài 40 SGK tr125 Mục 1 bạn nào làm jup mk vs

điên tích hình tron có duong kinh 4/5

Viết đoạn văn giới thiệu về tác giả chính hữu và bài đồng chí

V. Combine the following sentences using an appropriate relative clause. 1. My head teacher has such a good sense of humour. He usually makes everyone laugh by telling funny stories. ________________________________________________________ 2. I prefer traditional classrooms. I can interact face to face with the teachers and other students there. ________________________________________________________ 3. We are going to open a new English class. This class is totally online. ________________________________________________________ 4. Mr. Vinh is talking with the students. They are sharing their thoughts about the roles of schools in the future. ________________________________________________________ 5. My new school is bigger than the old one. You visited it two days ago. ________________________________________________________ 6. Dr. Anna Bennett is a senior lecturer at the National University. Her paper is about women’s roles in the 21st century. ________________________________________________________ 7. My brother has just graduated from Harvard University. Mark Zuckerberg, Facebook founder and CEO used to study there. ________________________________________________________ 8. Her husband will stay at home to look after the children. He used to be the breadwinner of her family. ________________________________________________________ 9. I have read an article about Silicon Valley. It is home to many of the world’s largest high-tech corporations. ________________________________________________________ 10. They will organise a farewell party for Ms. Jennifer Green next week. She has been our school principal for 8 years. ________________________________________________________X. Use the words given and other words, complete the second sentence so that it has a similar meaning to the first sentence. Do not change the word given. (Use 2 – 5 words in total). 1. My school is over 100 years old. which I’m studying ________________________ over 100 years old. 2. Students will share their thoughts about the dream school on the forum, on Students’ thoughts about the dream school ________________________the forum. 3. Ms. Kelly, our school principal, will attend our class this afternoon, is Ms. Kelly, ___________________________ , will attend our class this afternoon. 4. Homework will be sent through cyberspace, through Students _______________________ cyberspace. 5. The teacher meeting you yesterday is supervising our project, who The teacher ____________________________ is supervising our project.