Giúp giùm mình nha m.n hứa vote 5*+lời cám ơn 1. Cho tam giác ABC vuông tại A. Bt AB=6cm, AC=8cm. Vẽ đường cao AH. a) cm:tam giác ABC đồng dạng tam giác HAC b)Tính BC và AH c) tia phân giác ABC cắt AH tại D và AC tại E. CM: AB.HD=AE.HB 2. Cho tam giác ABC vuông tại A, đường cao AH (H thuộc BC) a) CM: tam giác AHB đồng dạng với tam giác CAB. b) Qua C kẻ đường thẳng song song với AB cắt AH tại D. CM: HC^2=HA.HD (Lm 1 câu vote 4*) lm đầy đủ và vẽ hình

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