user-avatar
1247661292292681
2 năm trước
cho tam giác abc nhọn,hai đường cao BE và CD a, chứng minh AD*AB=AE*AC b, chứng minh tam giác ADE đồng dạng tam giác ACB c,cho EB=EC ,F là trung điểm EC.Đường thẳng vuông góc với BF tại O vẽ từ E,cắt đường thẳng vuông góc với EC vẽ từ C tại K . chứng minh EF=CK
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

The programmes/ aim/ improve/ elephant protection and management/ reduce poaching/ the illegal ivory trade. It/ very necessary/ raise people’s awareness/ important role/ water/ their daily activities. Choose one word whose stress is placed differently from the others. important permanent convenient attractive “____” - "It was very sunny and hot. We had a bit of a heatwave. How was the wave? Did you enjoy your holiday? How was the beach? What was the weather like there? I had a ______ chat with my manager and gave him an update on the project. quick short lull brief This company can ____ for wage discrimination among workers of different genders. be suing be sued sue sued Chocolates and flowers are by far ____ presents for mothers on Mother's Day in the UK. more popular the more popular the most popular less popular This is my new tablet. It uses the latest digital technology. (Using a relative pronoun) "I'm sorry I couldn't come to your birthday party last Friday, Jane," Bod said. (Change into reported speech)

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