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kimkhanh778
2 năm trước
( giúp tuii với ) Trên cùng một nửa mặt phẳng bờ chứa tia tia Ox. Vẽ hai tia Oy, Oz sao cho ∠xOy = 30 độ, ∠xOz = 80độ. a. trong 3 tia Õ, Oz tia nào nằm giữa 2 tia còn lại? vì sao? b. Tính số đo góc yOz.
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