Trang Ánh Nam has left a new comment on your post "CÁC HỆ THỨC LƯỢNG TRONG TAM GIÁC VÀ GIẢI TAM GIÁC":
Bài 45: CHo tam giác ABC. Tìm góc A trong tam giác biết cạnh a,b,c thỏa mãn hệ thức:
b(b+a)(b-a)=c(c+a)(c-a) , (b≠c)
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Posted by Trang Ánh Nam to Học Để Thi at February 21, 2019 at 11:04 PM
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