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kieudiem2k1
2 năm trước
cho điểm o nằm trên dường thẳng xy .Vẽ hai tia oz và ot ở trên cừng một nửa mặt phảng bờ chứa là xy soa cho gó xoz =60 độgốc yot=40 độ tính góc yoz tính zot
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