Trang Ánh Nam has left a new comment on your post "CÁC HỆ THỨC LƯỢNG TRONG TAM GIÁC VÀ GIẢI TAM GIÁC":
Bài 46: Trong tam giác ABC, chứng minh rằng nếu diện tích tính theo công thức S=(a+b-c)(a-b+c)/4 thì tam giác ABC đều.
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Posted by Trang Ánh Nam to Học Để Thi at February 21, 2019 at 11:08 PM
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