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5a一a等于多少
更新时间: 2020-11-04 00:00:00  

5a一a等于4a,减法是基本的算术运算,从一个数量中减去另一个数量的运算叫做减法,其结果成为差。

减法不一定要硬算,也可以简算。这个方法适用于学前班、一年级的小孩学。例如:24-8=16

可以这样想:借位14-8,先用10-8=2,再用2+4=6,差个位一定就是6,十位算就简单了。就是说,借位后,去掉个位的数字先减,然后用减出来的数去加少减的个位的数,十位就不难了。

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