39乘82加19乘39减19简算

2025-05-01 04:19:16
推荐回答(2个)
回答1:

简算方法如下:
39×82+19×39-19
=39×82+19×39-(39-20)
=39×82+19×39-39+20
=39×(82+19-1)+20
=39×100+20
=3920

回答2:

39×82+19×39-19
=39×82+19×39-(39-20)
=39×82+19×39-39+20
=39×(82+19-1)+20
=39×100+20
=3920