2.61*39.5+28.7*261+9.05*26.1简便计算
问题描述:
2.61*39.5+28.7*261+9.05*26.1简便计算
答
2.61*39.5+28.7*261+9.05*26.1
=26.1×3.95+26.1×287+26.1×9.05
=26.1×(3.95+287+9.05)
=26.1×300
=7830