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madiuthanhspc15
2 năm trước
Cho cân tại O, kẻ OH vuông góc với PQ. a) Chứng minh b) Biết OP = 5cm, PQ = 6cm. Hãy tính OH. c)Trên tia đối của tia PQ lấy điểm D, trên tia đối của tia QP lấy điểm E sao cho PD = QE. Chứng minh rằng cân.
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