六点九乘以二十五点八加上歌零点三异常二百五十八用简便方法计算

2025-12-25 11:07:41
推荐回答(1个)
回答1:

6.9×25.8+0.31×258
=6.9×25.8+3.1×25.8
=(6.9+3.1)×25.8
=10×25.8
=258