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phamthilananh66
2 năm trước
Vẽ tam giác ABC nội tiếp đường tròn (O) vẽ thêm các đường cao AD,BE,CF cắt nhau tại H. Hai đường thẳng BE và CF cắt đường tròn (O) lần lượt tại P và Q a.CM tứ giác BCEF nội tiếp b. CM PQ//EF ai giúp em với ọa
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