Tag: 勾股定理

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170605-勾股定理说课-22140634

170605-勾股定理说课-22140634

Added by 7 年 ago

259 Views7 Comments

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180515-勾股定理-22150610

180515-勾股定理-22150610

Added by 6 年 ago

191 Views7 Comments

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