简便计算54321×12345-54322×12344

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/28 14:32:42

简便计算54321×12345-54322×12344

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