86乘584减84乘586怎么简便计算

分类: 作业答案 • 2022-01-09 18:03:27

问题描述：

86乘584减84乘586怎么简便计算

答

86x584-84x586
=(84+2)x584-84x(584+2)
=84x584+2x584-84x584-84x2
=2x584-84x2
=(584-84)x2
=500x2
=1000