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Vovanlien0805
2 năm trước
Qua đỉnh A của hình vuông ABCD có cạnh bằng a, vẽ 1 đường thẳng cắt cạnh BC ở M và đường thẳng DC ở I CM: $\frac{1}{AM^2}$ +$\frac{1}{AI^2}$ =$\frac{1}{a^2}$
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