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baconngu
2 năm trước
Cho tam giác ABC nhọn Vẽ đường cao BH,CK. Chứng minh rằng tam giác ABC đồng dạng với tam giác ACK và AH . AC = AK .AB Chứng minh rằng tam giác AHBđồng dạng với tam giác ABC Cho BC = 12 cm , S ahk/ S abc = 1/9, tính độ dài KH?
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