925| 0
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[求助] 四面体外接球和内切球半径的不等式 |
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毋因群疑而阻独见 毋任己意而废人言
毋私小惠而伤大体 毋借公论以快私情 |
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小黑屋|手机版|数学研发网 ( 苏ICP备07505100号 )
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