求11.9+3.1-(11.97-3.1)简便方法
问题描述:
求11.9+3.1-(11.97-3.1)简便方法
答
11.9+3.1-(11.97-3.1)
=11.9+3.1-11.97+3.1
=(11.9-11.97)+(3.1+3.1)
=-0.07+6.2
=6.13