(2.1+6.9*0.15)*0.1的简便方法？

Question

如题所述

Answer 1

（2.1+6.9×0.15）×0.1
=0.21+0.69×0.15
=0.21+0.7×0.15-0.01×0.15
=0.21+0.105-0.0015
=0.3135
那么这里可以通过上面的简便计算过程，进行详细的计算之后，得到答案是0.3135。