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Vinh123
2 năm trước
Cho tam giác ABC vuông tại A. Tia phân giác góc B cắt cạnh AC tại điểm M. Kẻ MD⊥BC tại D(D thuộc BC) g)Chứng minh BN vuông góc với AD,BN vuông góc với EC h)Tam giác ABC thỏa mãn điều kiện gì để tam giác NAD là tam giác đều?
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