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thanhtra91
2 năm trước
trên cùng một nửa mặt phẳng bờ chứa tia ox,vễ góc xoy =70 độ ,góc xoz=120 độ.vẽ ot là tia đối của tia oy.trong goc xoy lấy điểm a,trong goc yoz lấy điểm b.nối a với b cắt oy tại c
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