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2 năm trước
Cho hình chữ nhật ABCD, có AB = 2AD. Từ A kẻ một đường thẳng bất kỳ cắt cạnh BC và đường thẳng CD lần lượt tại M và N. Chứng minh: 4/AM2 + 1/AN2 có giá trị không đổi.
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