巧算12345×6789－12346×6788

来源：学生作业帮助网编辑：作业帮时间：2024/04/28 14:06:36

巧算12345×6789－12346×6788
巧算12345×6789－12346×6788

巧算12345×6789－12346×6788
=12345×(6788+1)-(12345+1)×6788
=12345×6788+12345×1-12345×6788-1×6788
=12345-6788
=5557

等比数列
所以原式=(1+i)*[1-(1+i)^20]/[1-(1+i)]
(1+i)²=1+2i-1=2i
所以原式=(1+i)*[1-(2i)^10]/(-i)
=(1+i)(1+1024)/(-i)
=-1025(1+i)*i/i²
=1025i-1025

巧算12345×6789－12346×6788 12345×6789-12346×6799巧算巧算12345×6789-123456×6788 12345*12348-12346*12346 12346+12345 24690/12346-12345×12347 12346^2-12345*12347 12345^2-12346^2 12345+6789是什么? 12345加6789! 12345除以12345又12346分之12345 12345²12344×12346＝?12345²-12344×12346＝? 12345²-12344*12346= 12346²-12345*12347= 24690/12346²-12347*12345 24690/12346^2-12345*13247) 123454321/12345*12345-12346*12344= 12345*12345-12344*12346的简便计算