12345×6789-12346×6799巧算

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/05/16 16:04:45

12345×6789-12346×6799
=12345*6789-12345*6799-6899
=12345*(-10)-6799
=-123450-6800+1
=-123449-6800
=-130249

12345*12348-12346*12346 12346+12345 24690/12346-12345×12347 12345^2-12346^2 12345除以12345又12346分之12345 12345²12344×12346＝? 24690/12346^2-12345*13247) 12346²-12345*12347= 24690/12346²-12347*12345 12345²-12344*12346= 1993 / 12346×12346-12345×12347的简便运算 12345的2次方-12344×12346=