12.5x79+12.5x2-12.5简便算法

来源:学生作业帮助网 编辑:作业帮 时间:2018/09/21 04:51:13
12.5x79+12.5x2-12.5简便算法12.5x79+12.5x2-12.5简便算法12.5x79+12.5x2-12.5简便算法12.5x79+12.5x2-12.5=12.5x(79+2-

12.5x79+12.5x2-12.5简便算法
12.5x79+12.5x2-12.5简便算法

12.5x79+12.5x2-12.5简便算法
12.5x79+12.5x2-12.5
=12.5x(79+2-1)
=12.5x80
=1000

12.5x79+12.5x2-12.5
=12.5*(80-1)+12.5*(2-1)
=125*8-12.5+12.5
=1000

=12.58*(79+2-1)