2018除以2019/2020简便运算?
2020-02-28
展开全部
2018÷2019/2020
=2018×2020/2019
=(2019-1)×2020/2019
=2019×2020/2019-1×2020/2019
=2020-2020/2019
=2020-1又1/2019
=2018又2018/2019(2018又2019分之2018)
=2018×2020/2019
=(2019-1)×2020/2019
=2019×2020/2019-1×2020/2019
=2020-2020/2019
=2020-1又1/2019
=2018又2018/2019(2018又2019分之2018)
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