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catinhok123
2 năm trước
Cho tam giác DEF có DE=3;DF=4;EF=5 . Khi đó: A.DE là tiếp tuyến của (F;3) B) DF là tiếp tuyến của ( E,3) C) DE là tiếp tuyến của ( E,4 ) Đ) DF là tiếp tuyến của ( F,4)
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