Cho tam giác ABC vuông tại A. Lấy B làm tâm vẽ đường tròn tâm B bán kính AB.Lấy C làm tâm vẽ đường tròn tâm C bán kính AC, hai đường tròn này cắt nhau tại điểm thứ 2 là D.Vẽ AM, AN lần lượt là các dây cung của đường tròn (B) và (C) sao cho AM vuông góc với AN và D nằm giữa M; N. a) CMR: ΔABC = ΔDBC b) CMR: ABDC là tứ giác nội tiếp c) CMR: Ba điểm M, D, N thẳng hàng d) Xác định vị trí của các dây AM; AN của đường tròn (B) và (C) sao cho đoạn MN có độ dài lớn nhất. Chuyên gia hangbich ơi giúp em với ạ Và các chuyên gia khác giúp em với ạ

Các câu hỏi liên quan

Ex 5: Fill in each blank with one of the conjunctions "and/ or/ but/ so/ because/ although" to complete the sentences. 1. Is her child a boy ……………a girl? 2. I forgot to bring the map, ……………….I got lost. 3. He failed the examination …………………..he didn't study hard. 4. Lien won the match ………………………. she was injured. 5. My new classmate is quite friendly …………………… sociable. 6. I don't like watching films on TV …………………….. I like watching them at the cinema. 7. She likes watching cartoons ………………………….they are colorful and funny. 8. He helps his friends a lot …………………. he is very busy. 9. Lan sings very well …………………..she cannot sing in front of many people. 10. The movie was very boring ……………….. we went out to go shopping. Ex 6: Fill in each blank with a suitable clause to complete the compound sentences. A. because it is bad for your health B. and this programme is on VTV3 C. so you will be fat; because the old one is broken; D. though it's not good for your health; E. but it is broadcast too late 1. You should eat less junk food .................................................................................................................................. 2. I want to watch this programme ............................................................................................................................ 3. My father will buy a new television …………………………………………………………………………………. Ex 7: Fill in each blank with a suitable clause to complete the compound sentences. A. Though his clothes are old B. and don't enter this room C. so TV is a good way to entertain D. Although he is young E. or you can do more exercise F. because it's not good for your eyes 1. ……………………………they look very clean and of good quality. 2. Don't spend too much time watching TV…………………………………………………… 3. You can eat less, ……………………………………………………………