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Nguyetlao157
2 năm trước
Cho góc nhọn xOy và tia phân giác Oz của góc đó.Trên tia Ox lấy điểm A, trên tia Oy lấy điểm B sao cho OA=OB. Trên tia Oz lấy điểm I. Chứng minh: a. Tam giác AOI=Tam giác BOI b. AB vuông góc OI
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