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mphg179
2 năm trước
Cho tam giác ABC nhọn, AB < AC nội tiếp (O; R), kẻ đường cao AH của tam giác ABC, kẻ đường kính AD của tâm O. a) C/m: AB.AC = AH.AD; b)C/m: S tam giác ABC = (AB.AC.BC) / 4R
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