简便计算54321×12345-54322×12344_数学解答

简便计算54321×12345-54322×12344

人气：293 ℃　时间：2020-04-16 23:15:19

解答

原式=54321×12345-(54321+1)×12344
=54321×12345-54321×12344-12344
=54321×(12345-12344)-12344
=54321-12344
=41977