3.9x7.8+61x0.78怎样简便计算?

2025-04-04 22:49:19
推荐回答(1个)
回答1:

3.9X7.8+61X0.78
=3.9X7.8+6.1X7.8
=(3.9+6.1)X7.8
=10X7.8
=78