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Cho ∆ABC vuông tại A. Đường cao AH. AB= 3, AC= 4 a) Tính BH, CH, AH b) Vẽ HD vuông góc AB, HE vuông góc AC Chứng minh: AB= AE. AC DH^2= AD. DB HE^2= AE. EC c) Chứng minh: ADHE là hình chữ nhật d) Chứng minh AD. DB+ AE. EC=AH^2
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