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preferto2010
2 năm trước
Cho đường tròn (O). Từ điểm A nằm ngoài đường tròn (O), kẻ các cát tuyến ABE, ADC sao cho CAE=$40^{0}$ , CBE=$80^{0}$ . Số đo cung BnD là? Giúp mình với, mình đang cần gấp. Cảm ơn!!
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