12.7*9.9+12.7怎样简便计算

2025-06-26 18:02:05
推荐回答(1个)
回答1:

12.7×9.9+12.7
=12.7×(10-0.1)+12.7
=12.7×10-12.7×0.1+12.7
=127-1.27+12.7
=138.43