Bài 1: Cho tam giác ABC vuông tại A, đường cao AH. Biết BH = 9cm, HC = 25cm. a ,Tính độ dài các đoạn thẳng AH, AC. b,Vẽ đường phân giác trong AK của tam giác ABC (K thuộc BC). Tính AĤK . Tính tỉ số diện tích các tam giác ABH và ABK. giúp em phần B bài này với ạ a, AH= 15cm, AC= 5 $\sqrt[n]{x}$ 34

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