86乘584减84乘586怎么简便计算_数学解答

86乘584减84乘586怎么简便计算

人气：219 ℃　时间：2020-04-18 03:00:21

解答

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