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dongmuonmot
2 năm trước
Cho tam giác ABC vuông tại A, AB=12cm, AC=16cm, đường phân giác góc A cắt BC tại D đường cao ah. Tính đoạn thẳng bd, dc. Tính độ dài đoạn thẳng ad. Trong adb kẻ de (e thuộc ab), trong adc kẻ df (f thuộc ac). Chứng minh rằng: Ea/eb . db/dc . fc/fa = 1 Em cần gấp ạ ;;-;;
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