Trang Ánh Nam has left a new comment on your post "CÁC HỆ THỨC LƯỢNG TRONG TAM GIÁC VÀ GIẢI TAM GIÁC":
Bài 38: gọi S là diện tích tam giác ABC. CHứng minh rằng:
a. S=2.R.R.sinA.sinB.sinC
b.S=Rr(sinA+sinB+sinC)
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Posted by Trang Ánh Nam to Học Để Thi at February 21, 2019 at 10:50 PM
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