2.5×0.8--1.8×0.5简便算法

2025-05-18 11:13:59
推荐回答(2个)
回答(1):

2.5×0.8-1.8×0.5
=2.5×4×0.2-1.8×0.5
=10×0.2-0.9
=2-0.9
=1.1

回答(2):