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lethikimoanh12389568075
2 năm trước
Cho tam giác ABC, I là giao điểm của 2 đường phân giác .Đt vuông góc vs CI tại I cắt AC và BC lần lượt ở M ,N.CMR: a, AN.BI=AI=IM b,BM.IA=BI.NI mọi ng ơi giúp mk vs ạ .cảm ơn mn rất nhiều
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