user-avatar
khak32hoa
2 năm trước
Cho tam giác nhọn abc (ab<ac)các đường cao bk ce cắt nhau tại H các đường thẳng vuông góc với ab tại b vuông góc với ac tại c cắt nhau ở d chứng minh a, bdch là hình bình hành b, H,M,D thẳng hàng (M là trung điểm BC) c, OM=1/2 AH(O là trung điểm AD)
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

I. Complete each of the following sentences with comparatives or superlatives. Add ‘the’ where necessary. 1. I think this is (noisy) _______________ part of the city. 2. This place was (dangerous) _______________ than we thought. 3. Could you show me the way to (near) _______________ bus stop? 4. The trip to Ho Chi Minh City was (interesting) _______________ for us. 5. This is (good) _______________ food I’ve ever eaten in this country. 6. David’s new haircut is (trendy) _______________ than the previous one. 7. The building looks much (nice) _______________ in green than the previous white. 8. I had to drive my car along (narrow) _______________ road in the region. 9. Quan’s house is (far) _______________ from the city centre than my house. 10. In my opinion, living in the city is (hard) _______________ than living in the country. II. Rewrite the following sentences using questions words + to-infinitives. 1. We don’t know where we should put the sofa. 2. The rules didn’t specify who I should speak to in case of an emergency. 3. Mai wondered how she could ride the scooter. 4. Let us decide when we should start the project. 5. Could you tell me where I can find a good hotel? 6. We must find out what we are to do next. 7. A good dictionary tells you how you should pronounce the words. 8. We are not sure who we will meet at the entrance. 9. I can’t remember when I have to turn off the oven. 10. Do you know what you should look for? III. Read the situations and write wishes you want to make for them. 1. Many schools are overcrowded because there are so many children in Viet Nam. I wish ................................................. 2. My school has no playground equipment or extra activities. I wish ............................ 3. In the Mekong Delta, small children go through some foot bridges in order to get to school. I wish ...................................................... 4. Kindergarten teachers don’t have training courses in making handmade teaching materials. I wish ....................................................... 5. Children from poor families can’t go to school because they have to earn money to support their families. I wish ........................................................................

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