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[几何] 求锐角

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guanmo1 Posted 2014-2-20 11:44 |Read mode

如图

平行四边形.jpg

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平行四边形 $ABCD$ 中，$AC^2+BD^2=AB^4+AD^4$，则该平行四边形锐角为________。

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kuing Posted 2014-2-20 14:15

少条件

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