trên cùng một nửa mặt phẳng m chứa tia ox vẽ hao oy oz sao cho cho góc zoy =100 độ,góc xoz =50 độ a: tính góc zoy b: tia oz có phải là tia phân giác của xoy không vì sao c: gọi ot là tia đối của tia oz tính góc toy

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