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2 năm trước
Cho góc bẹt xOy a, Vẽ tia Om sao cho xOm = 80 độ. Nhận xét mối quan hệ của hai góc xOm và mOy ? b, Tính góc yOm. c, Vẽ tia Ot là tia phân giác của góc yOm. Tính góc tOm.
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