2进制加法－笔算
一开始做了乘法，但是发现儿子再做两位数加法时也很容易出错。我做了一个练习计算的应用程序，希望可以帮组儿子的学习。它包含了无进位加法和有进位加法两部分，共提供了146套题。每套中有20题，一天一套的话，应该就能有效果。特别是有进位，一共提供了96套题，基本上覆盖了所有的2进位有进位加法的所有题目。另外...
2进制加法－笔算
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