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Ryoon
2 năm trước
Vẽ góc bẹt xox' và tia oy Sao cho góc xoy=60 độ a, Tính Số đo góc yox' b, Vẽ tia phân giác ot của góc xoy và tia phân giác ot' của góc yox'.Tính góc tot' c, Hỏi góc toy và yot' có phụ nhau ko? Tại sao?
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