user-avatar
hanguyenyennhi
2 năm trước
Cho tam giác ABC có AB >AC .Trên cạnh AB lấy 1 điểm D sao cho AD =AC .Vẽ đg tròn tâm O ngoại tiếp tam giác DBC .TỪ O lần lượt hạ các đg vuông góc OH,OK xuống BC và BD ( H thuộc BC ,K thuộc BD) a) Chứng minh rằng OH<OK. b) So sánh hai cung nhỏ BD và BC
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

REVISION FOR GRADE 7 (19-02-2020) * Choose the best word. 1. _______her brother ________his English homework yesterday? A. Didn’t/ do B. Doesn’t/ do C. Isn’t doing D. Aren’t doing 2. His sister___________play badminton next week. A. doesn’t B. didn’t C. aren’t going to D. isn’t playing to 3. _______her parents_________Phong Nha Cave every year? A. Do / go B. Does/take C. Do / give D. Do / visit 4. Her father__________her a nice school bag every school year. A. buying B. buys C. bought D. will buy 5. ________my sister__________this play last month? A. Does/ rehearse B. Is/ rehearsing C. Did/ rehearse D. Are/ rehearsing 6. _______his mother_________ me a letter yesterday? A. Did/ sent B. Does/ send C. Did/ send D. are/sending 7. _________your friends ____________playing the guitar at present? A. Is/ practicing B. Do/ practice C. Did/practices D. Are/ practicing 8. ______his brother________my sister to the beach yesterday? A. Didn’t/ took B. Doesn’t/ take C. isn’t taking D. Didn’t/ take 9. _______Mrs. Lan__________me English last year? A. Does/ teach B. Is/ teaching C. Was/ teach D. Did/ teach 10 . His parents____________the animals on a farm at the moment. A. was feeding B. are feeding C. is feeding D. were feeding

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team