cho ΔABC cân tại A.trên tia đối của tia BC và tia CB lấy theo thứ tự điểm D và E sao cho BD=CE a,chứng minh ΔADE cân b,gọi M là trung điểm BC.chứng minh AM là tia phân giác của góc DAE và AM ⊥DE c,từ B và C kẻ BH,CK theo thứ tự vuông góc với AD,AE .chứng minh BH=CK d,chứng minh HK song song với BC giúp em nhaaaaaaaaa vẽ hình nữa ạ

giúp vs mụa người .......................................

Viết chữ cali: "duongthaibao" Nhanh nha ai nhanh mình cho hay nhất

Nêu định nghĩa, t/c, lấy vd(liệt kê) của oxit lưỡng tính và trung tính

8) -2(x- 7)(x + 3) + (5x – 1)(x + 4) – 3x² – 27x 9) (6x -5)(x + 8) – (3x – 1)(2x + 3) – 9(4x – 3) 10) (8x – 1)(x + 7) – (x – 2)(8x + 5) – 11(6x + 1) chứng minh rằng giá trị của các biểu thức sau ko phụ thuộc vào giá trị của biến x

77. Does your school have over 800 pupils? Are............................................................................................

1. I can’t understand the French visitors. I wish I ________French. A. knew B. will know C. know D. have known 2. The church ________about 100 years ago. A. is built B. was built C. will be built D. has been built 3. People in Israel are going to celebrate their festival ________is called Passover. A. whose B. who C. which D. where 4. ________I was really tired , I couldn’t sleep. A. Even though B. So C. Therefore D. Because of 5. Lan is very tired. ________, she has to finish her assignment before going to bed. A. Although B. So C. Therefore D. However 6. I suggest ________some money for poor children. A. raise B. to raise C. raised D. raising 7. She asked me if I ________a laptop computer the following day. A. buy B. will buy C. bought D. would buy 8. I ________telephone her if I knew her number. A. would B. have to C. will D. shall 9. Honda motorbikes ________in Viet Nam. A. produce B. will produce C. are produced D. would be produced 10. We have learnt English ________2001. A. for B. since C. in D. during 11. We ________already ________Huong Pagoda. A. were…seeing B. have…seen C. are…seeing D. will…see 12. All the houses in the area ________immediately. A. has to rebuilt B. had to rebuild C. have to be rebuilt D. have to rebuild 13. If he ________soon, he might miss the train. A. isn’t coming B. doesn’t come C. won’t come D. didn’t come 14. Mr. Long said that he ________in Ho Chi Minh City. A. lived B. is living C. has lived D. will live 15. Your sister works in a foreign company, ________she? A. isn’t B. didn’t C. wasn’t D. doesn’t

chứng minh rằng giá trị của các biểu thức sau ko phụ thuộc vào giá trị của biến x

a)4x²(2x³-x+3) b)(2x-3)(4x²-6x+9)-8(x³+3) c)(x-2)²-2(x+2)(x-1)+(x+1) giúp mik nhanh vs ạ mik cảm ơn

1. "How much do you think it will cost?" he said to me. - He asked me_________________________________________________________. 2. Mr.Brown's team has lost the game. He looks very sad. - Mr. Brown whose______________________________________________________. 3. Do you know the man who sat next to me at Nam’s birthday party last night? - You know____________________________________________________________. 4. It takes Minh 2 hours to do his homework every day. - Minh spends___________________________________________________________. 5. We were late for school because of the heavy rain. - Because it_____________________________________________________________. 6. My mother used to make us clean the house. - We used______________________________________________________________. 7. "I'm working in a restaurant, and don't care much for it."she said - She said______________________________________________________________. 8. It’s two years since I last spoke to her. - I haven’t______________________________________________________________. 9. Going swimming in the river in the summer is interesting. - It____________________________________________________________________.