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一年级05分成合成10的组成，记住10的组成，为凑十法折十法作铺垫
首发 一年级05分成合成10的组成，记住10的组成，为凑十法折十法简算等作铺垫，，，太重要了，以后的几年学习都要用到，所以 单独列出来.
一年级数学下册3/416
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