写出算式,简便算法如下:
(2019/2020)x2021
=(2019/2020)x(2020+1)
=(2019/2020)x2020+(2019/2020)x1
=2019+(2020-1)/2020
=2019+1-1/2020
=2020-1/2020
=2019.999505 。
写出算式,简便算法如下:
(2019/2020)x2021
=(2019/2020)x(2020+1)
=(2019/2020)x2020+(2019/2020)x1
=2019+(2020-1)/2020
=2019+1-1/2020
=2020-1/2020
=2019.999505 。