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2019.11.12大a班杨寓翔数的守恒

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26翔宝 Leo
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Published on 12 Nov 2019 / In Education environment

数的守恒

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刘
6 years ago

宝贝很不错哟,数的守恒是指物体的数目不因物体外部特征(颜色、形状、大小等)和排列方式的改变而变化。看来你已经掌握了哟。^_^

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