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Cho tam giaùc ABC coù 3 goùc nhoïn noäi tieáp trong ñöôøng troøn taâm O.Tieáp tuyeán taïi B vaø C cuûa ñöôøng troøn caét nhau taïi D.Töø D keû ñöôøng thaúng song song vôùi AB,ñöôøng na[r]
Toán 9 Hình Học [123doc] 100 bài Toán hinh học lớp 9 phan 2
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