如题所述
第1个回答 2020-03-03
2019×2019/2020
=(2020-1)×2019/2020
=2020×2019/2020-2019/2020
=2019-2019/2020
=2018又1/2020
2019×2019/2020
=2019×(1-1/2020)
=2019-2019×1/2020
=2019-2019/2020
=2018又1/2020本回答被网友采纳
=(2020-1)×2019/2020
=2020×2019/2020-2019/2020
=2019-2019/2020
=2018又1/2020
2019×2019/2020
=2019×(1-1/2020)
=2019-2019×1/2020
=2019-2019/2020
=2018又1/2020本回答被网友采纳