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Iuphaidau
2 năm trước
a, Vẽ góc bẹt xOy b, Vẽ tia Ot sao cho xOt= 30 độ c, Vẽ tia Oz sao cho yOz= 30 độ ( Ot và Oz cùng nằm trên 1 nửa mặt phẳng bờ cy
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