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Dotoan
2 năm trước
Cho góc xoy nhọn trên tia ox lấy điểm B, trên tia oy lấy điểm D sao cho OB=OD. Trên tia ox lấy điểm C, trên tia oy lấy điểm E sao cho góc ODC= góc OBE CM: tam giác OBE= tam giác ODC -> BE=CE
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