VISUAL METHOD AND DEVICES FOR AIDING TEACHING AND LEARNING MATHEMATICAL OPERATIONS WITH SIGNED NUMBERS

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  机译： 基于桌上游戏的数学教学辅助工具和在该辅助工具上执行计算操作的方法

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  机译： 基于桌上游戏的数学教学辅助工具和在该辅助工具上执行计算操作的方法

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  机译： 学习数学的教学援助及其操作方法

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