12345^2-12346^2

12345^2-12346^2 12346^2-12345*12347 24690/12346^2-12345*13247) 12345的2次方-12344×12346= 12346^2-12345*12347分之24690=? 算计：24690/(12346^2-12345*12347)要过程啊~~~~ 12345*12348-12346*12346 12346+12345 24690/12346-12345×12347 12345除以12345又12346分之12345 12345²12344×12346＝?12345²-12344×12346＝? 12345²-12344*12346= 12346²-12345*12347= 24690/12346²-12347*12345 12345×6789-12346×6799巧算 123454321/12345*12345-12346*12344= 12345*12345-12344*12346的简便计算 不是123154321除以12345*12345-12346*12344是123454321除以12345*12345-12346*12344