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Kimvien2511
2 năm trước
cho một hình vuông ABCD và 1 đường thẳng đi qua A cắt cạnh BC tại M và DC tại N. Từ A kẻ đường thẳng vuông góc với AM cắt tia CB tại P. CMR: a) AN = AP b) $\frac{1}{AM^{2}}$ + $\frac{1}{AN^{2}}$ = $\frac{1}{AB^{2}}$
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