三十九点七乘二点八加三点九七乘七十二怎样简便计算

2024-11-25 04:52:50
推荐回答(2个)
回答1:

39.7 x2.8+3.97x72
=39.7x2.8+39.7x7.2
=39.7x(2.8+7.2)
=39.7x10
=397

回答2:

39.7×2.8+3.97×72
=3.97×28+3.97×72
=3.97×(28+72)
=3.97×100
=397