2.8×1.1 99×0点八巧算怎么做?

2025-03-21 05:59:27
推荐回答(1个)
回答1:

巧算
2.8×1.1
=2.8×1+2.8x0.1
=2.8+0.28
=3.08
99×0.8=100x0.8-0.8=79.8