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Linhnino1308
2 năm trước
trên cùng một nửa mp bờ là đường thẳng chưa tia ã,vẽ hai tia ay và az sao cho xay=120độ và xaz=150 độ a)Tính yaz b) vẽ tia at là tia phân giác cảu xay chứng minh taz là góc vuông
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