user-avatar
Vothin22
2 năm trước
Cho tứ giác ADCD nội tiếp đường tròn (o).Gọi I là giao điểm của AC và BD a) Chứng minh IA.IC=IB.ID b) Hai đường thẳng AB và CD cắt nhau tại S. Chứng Minh SA.SB=SC.SD
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

C. WRITING I. Rewrite the sentences without changing the meaning. 1. We have languages. We use them for communication. If we didn’t ………………………………………………………………………… 2. Five students will be awarded a present. Their test results are excellent. Five ………………………………………………………………………………… 3. We have senses. They allow us to learn languages. If we didn’t ………………………………………………………………………… 4. Our sense of sight allows us to read the written language. If we didn’t ………………………………………………………………………. 5. They are looking for the girl and her dog. They have lost the way in the forest. They ……………………………………………………………………………………... II. Use the words or phrases given to write meaningful sentences about the ways to improve your spoken English in a conversation. 1. most important/ goal/ speaking English/ communicate. ……………………………………………………………………………………………………… 2. Although/ speaking English fast/ make/ you/ sound/ native speaker,/ it/ make/ other people/ difficult/ understand you. ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… 3. Thinking/ English/ thing/ you can practice/ all/ time/ because/ it/ really important/ when/ speak/ English. ……………………………………………………………………………………………………… 4. If you/ forget/ word/ we/ stop/ sentence/ middle/ or/ use/ other words/ describe it. ……………………………………………………………………………………………………… 5. Self-confidence/ help/ speak better/ every English conversation. ………………………………………………………………………………………………………

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