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hkthilx91
2 năm trước
Cho tam giác ABC vuông tại A.Đường cao AH.Gọi E,F là hình chiếu của H trên AB và AC. a,Tứ giác AFHE là hình gì? b,CM: AB^2=BH.BC c,AH^2=BH.HC d, AB.AC=AH.BC
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