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Doxdemon
2 năm trước
Câu 1:Từ 1 điểm A ở bên ngoài ( O, R), vẽ hai tiếp tuyến AB, AC với đường tròn. Đường thẳng vuông góc với OB tại O cắt tia AC tại N. Đường thẳng vuông góc với OC tại O cắt tia AB tại M. Tứ giác AMON là hình: Câu 2:Cho ( O ), các điểm A, B, C nằm trên đường tròn. Biết sđcung AB = 100 độ; sđ cung CB là 60 độ. Số đo của góc ở tâm AOC là: 30 độ hoặc 170 độ. 50 độ hoặc 150 độ. 60 độ hoặc 140 độ. 40 độ hoặc 160 độ. Câu 3 Câu 4 Câu 5
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