0.87*3.16+4.64怎么样运算简便
问题描述:
0.87*3.16+4.64怎么样运算简便
答
0.87*3.16+4.64
=(1-0.13)*3.16+4.64
=3.16-0.13*3.16+4.64
=7.8-0.4108
=7.3892