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[探索发现] 勾股定理是谁发现的? |
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[fly] 知足常足 终身不辱 知止常止 终身不耻 [/fly]
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[fly]
一杯茶 品人生沉浮 平常心 阅万千世界
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Archiver|手机版|小黑屋|中花 ( 鲁ICP备07009421 )
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