请帮忙看看,谢谢

2025-12-04 16:12:33
推荐回答(1个)
回答1:

0.8×(0.5+0.8)-0.5×0.8×0.8-0.5×0.5×0.8
=0.8×1.3-0.32-0.2
=0.52
求采纳