2017x2018+2019x2020-2x2018x2019巧算

2017x2018+2019x2020-2x2018x2019巧算
2025-06-27 20:00:22
推荐回答(1个)
回答1:

2017x2018+2019x2020-2x2018x2019巧算
=2019x(2020-2018)+2018x(2017-2019)
=2019x2+2018x(-2)
=4038-4036
=2