七点四九乘以九点九脱式计算用简便算法等于多少

2025-03-24 22:32:49
推荐回答(1个)
回答1:

7.49x9.9
=7.49x(10-0.1)
=7.49x10-7.49x0.1
=74.9-0.749
=74.151