简便计算53乘54+54乘16+69乘25+21乘69

分类: 作业答案 • 2021-12-19 20:03:57

问题描述：

答

53x54+54x16+69x25+21x69
=54x(53+16)+69x(25+21)
=54x69+69x46
=69x(54+46)
=69x100
=6900