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q.thang86
2 năm trước
cho góc xOy =30 độ. Vẽ góc yoz kề bù với góc xoy .Vẽ góc zOt =60 độ sao cho tia ot nằm giữa hai tia ox và oy. Đường thẳng chứa tia ot và đường thẳng chứa tia ot và đường thẳng chứa tia oy có vuông góc với nhau không?
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