2.3×0.1+2.9×0.9,简便方法怎么计算?

2025-04-02 08:09:25
推荐回答(3个)
回答1:

原式==2.3×(1-0.9)+2.9×0.9
=2.3-2.3×0.9+2.9×0.9
=2.3+0.9×(2.9-2.3)
=2.3+0.9×0.6
=2.3+0.54
=2.84

回答2:

原式=(2.9-0.6)×0.1+2.9×0.9
=2.9×0.1+2.9×0.9-0.6×0.1
=2.9-0.06
=2.84

回答3:

2.3×0.1+2.9×(1-0.1)=2.3×0.1+2.9-2.9×0.1=(2.3-2.9)×0.1+2.9=2.84