1.小学一年级十以内的加法:怎么保证两个数加起来≤10(找到的代码两个加数<10,有些加起来>10)2.十以内的减法:怎么保证被减数>减数,得数≤103.退位减法、不退位减法怎么弄4.进位加法怎么做?5.除法怎么保证得数是整数、有限小数、循环小数
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