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