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nguyentai23012003
2 năm trước
cho góc xoy bằng 80 độ om llaf tia phân giác của góc xoy . gọi ox là tia đối của tia ox và on là tia phân giác của góc xoy. tính góc xom .Chứng minh tia oy nằm giữa 2 tia om và on . Chứng minh góc mon =90 độ
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