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ryo1209
2 năm trước
Trên cùng một nửa mặt phẳng bờ chứa tia Ox, vẽ tia Oy, Oz sao cho xOy=70', xOz=140' a. Trong 3 tia, Oy , Ox , Oz tia nào nằm giữa 2 tia còn lại. Vì sao? b. Tính yOz c. Tia Oy có phải là tia phân giác của xOz không? Vì sao? d. Vẽ tia Om là tia đối của tia Ox, tia On là tia phân giác của yOm. Tính nOz?
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