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himchin765
2 năm trước
cho tam giác ABC vuông tại A, gọi AD là đường phân giác của góc BAC; AE là đường phân giác góc ngoài của tam giác ABC tại đỉnh A. C/m $\dfrac{1}{AB^2}$ + $\dfrac{1}{AC^2}$ + $\dfrac{1}{AD^2}$ + $\dfrac{1}{AE^2}$
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