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seinlou312
2 năm trước
Cho góc xOy khác góc bẹt , trên tia Ox lấy 2 điểm A và D trên tia Oy lấy 2 điểm C và E sao cho OD = OE và OC = OB a, chứng minh tam giác ODC và tam giác OBE bằng nhau. b, Gọi A là giao điểm của BE và CD . Chứng minh tam giác AOB bằng tam giác AOC . c, Chứng minh BC vuông góc với OA.
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