12.45一1.96一0.8用简便方法计算

2025-05-09 02:39:04
推荐回答(2个)
回答1:

12.45-1.96-0.8
=12.45-2+0.04-1+0.2

=9.45+0.24
=9.69

回答2:

把0.8看成0.45+0.O4+0.31
(12.45-0.45)-(1.96+0.04)-0.31