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dangle129
2 năm trước
Cho tam giác ABC vuông tại A có góc B=60⁰. Vẽ tia Cx vuông với BC ( CE và CA nằm cùng phía với BC). Trên tia Cx lấy CE=CA, kéo dài CB lấy đoạn BF=BA a) CM: tam giác ACE là tam giác đều b) CM: 3 điểm E,A,F thẳng hàng
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