123×5.67+8.77×569,用简便计算.

123×5.67+8.77×567
=123×5.67+877×5.67
=(123+877)×5.67
=1000×5.67
=5670
同样的：
123×5.69+8.77×569
=123×5.69+877×5.69
=(123+877)×5.69
=1000×5.69
=5690