6.5×9.9+56.5简便计算

6.5×9.9+56.5简便计算
2025-04-27 15:46:09
推荐回答(1个)
回答1:

6.5×9.9+56.5
=6.5×(10-0.1)+56.5
=6.5×10-6.5×0.1+56.5
=65+56.5-0.65
=121.5-0.65
=120.85