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dai.uy.mafia
2 năm trước
d Bài 2: Cho tam giác ABC có AB =c , BC = a , CA=b và diện tích là S Gọi ha, , hb , hc lần lượt là độ dài đường cao qua các đỉnh A , B.C. Chứng minh rằng : 1) b²+a²>= 4 S 2) a.h + b.he+ c.ha >=6 S
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