20.21×1.9+202.1×0.07-2.021×6的简便算法怎么计算?

20.21×1.9+202.1×0.07-2.021×6的简便计算

第1个回答  2020-07-17
20.21×1.9+202.1×0.07-2.021×6
=20.21×1.9+20.21×0.7-20.21×0.6
=20.21×(1.9+0.7-0.6)
=20.21×2
=40.42
第2个回答  2020-07-17
20.21*1.9+202.1*0.07-2.021*6
=20.21*1.9+20.21*10*0.07-20.21*0.1*6
=20.21*(1.9+0.7-0.6)
=20.21*2
=40.42