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2014*20152015 15*20142014

2014*20152015-2015*20142014 =(2015-1)*20152015-2015*20142014 =2015*20152015-20152015-2015*20142014 =2015*(20152015-20142014)-20152015 =2015*10001-20152015 =2015*(10000+1)-20152015 =2015*10000+2015-(20150000+2015)把20152...

2014*20152015-2015*20142014 =2014*20152015-(2014+1)*20142014 =2014*20152015-2014*20142014-1*20142014 =2014*(20152015-20142014)-20142014 =2014*10001-20142014 =2014*(10000+1)-20142014 =2014*10000+2014*1-20142014 =20140000-2...

2015*20142014+2014*20152015 =2015*(20140000+2014)+2014*(20150000+2015) =2015*2014*10000+2015*2014+2014*2015*10000+2014*2015 =2014*2015*2*10000+2014*2015*2

就是等比级数,如果无限,就等于2014

(20142014+1)*20152014-20142014*(20152014+1)=20142014*20152014+20152014-20142014*20152014-20142014=10000 追问: 谢谢你啊!

2014x20152015-2015x20142014 =2014x2015x10001-2015x2014x10001 =(2014x2015-2015x2014)x10001 =0x10001 =0

2014x20152015-2015x20142014 =2014×2015×10001-2015×2014×10001 =2014×2015×(10001-10001) =2014×2015×0 =0

原式 =2014x2015x10001-2015x2014x10001 =2014x(2015x10001-2015x10001) =2014x0 =0

2014x20152015-2015x20142014 2014x2015x10001-2015x2014x10001 =2014x(2015x10001-2015x10001) =2014x0 =0

20142015*20152014-20142014*20152015=(20142014+1)*(20152015-1)-20142014*20152015=20152015-20142014-1=10000

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