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lkh231
2 năm trước
Mng ơi giúp mình với nha, mình cảm ơn nhiều Cho điểm A ở trong (O), lấy B ngoài (O) sao cho trung điểm I của AB nằm trong đường tròn, qua I, kẻ dây MN vuông góc với OI. C/m AMBN là hình bình hành.
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