Question

一道不懂得数学计算题

0.9999*7.2-0.1111*1.8
用简便方法计算，知道的朋友分享一下答案，谢谢！

Answer 1

解：原式=0.1111*9*7.2-0.1111*1.8
=0.1111*64.8-0.1111*1.8
=0.1111*（64.8-1.8）
=0.1111*63
=6.9993

Answer 2

0.9999*7.2-0.1111*1.8
=9*0.1111*4*1.8-0.1111*1.8
=36*0.1111*1.8-0.1111*1.8
=35*0.1111*1.8
接下来是计算了，不用我再算了吧

Answer 3

这样比较简单吧
原式=0.9999×7.2-0.9999×0.2
=（1-0.0001）×7
=6.9993