7.69*101 0.25*39+0.25 简便运算
问题描述：
7.69*101 0.25*39+0.25 简便运算
答
7.69*101
=7.69*(100+1)
=7.69*100+7.69*1
=769+7.69
=776.69
0.25*39+0.25
=0.25*(39+1)
=0.25*40
=10