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winnerolympia2406
2 năm trước
CHO TAM GIÁC ABC . TRÊN TIA ĐỐI CỦA AB LẤY AD=AB . GỌI BI,EJ LÀ CÁC ĐƯỜNG PHÂN GIÁC CỦA TAM GIÁC ABC VÀ TAM GIÁC ADE . CHỨNG MINH; A) GÓC ABI = GÓC AEJ B) BI=EJ
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