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thinh
2 năm trước
cho tam giác MNP vuông cân ở M, một đường thẳng d bất kỳ đi qua M ( d không cắt đoạn NP).Kẻ PB vuông góc với d (B thuộc d).Trên tia đối của tia MB lấy điểm A sao cho AM=BP.Tứ giác ANPB là hình gì?Vì sao?
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