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tomyminhthuy199
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5. Trên cùng một nửa mặt phẳng có bờ chứa tiaOx; vẽ hai tia Ot, Oy sao cho góc xOt bằng 30 , góc xOy bằng 60 a. Tia Ot có nằm giữa hai tia Ox và Oy không? Vì sao? b. So sánh góc tOy và góc xOt c. TiaOt có là tia phân giác của góc xOy không? Vì sao? d. Vẽ tia Ox’ là tia đối của tia Ox. Tính số đo góc kề bù với góc xOy
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