2013×2015-2012×2014 简便计算啊啊啊吖

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2013×2015-2012×2014 简便计算啊啊啊吖
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2013×2015-2012×2014 简便计算啊啊啊吖
2013×2015-2012×2014 简便计算啊啊啊吖

2013×2015-2012×2014 简便计算啊啊啊吖

2013 X 2015 - 2012 X 2014
= ( 2014 - 1 )( 2014 + 1 ) - ( 2013 - 1 )( 2013 + 1 )
= ( 2014" - 1" ) - ( 2013" - 1" )
= 2014" - 1 - 2013" + 1
= ( 2014 - 2013 )( 2014 + 2013 )
= 1 X 402...

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2013 X 2015 - 2012 X 2014
= ( 2014 - 1 )( 2014 + 1 ) - ( 2013 - 1 )( 2013 + 1 )
= ( 2014" - 1" ) - ( 2013" - 1" )
= 2014" - 1 - 2013" + 1
= ( 2014 - 2013 )( 2014 + 2013 )
= 1 X 4027
= 4027
或者
= ( 2014 - 1 )( 2014 + 1 ) - 2012 X 2014
= 2014" - 1 - 2012 X 2014
= 2014 X ( 2014 - 2012 ) - 1
= 2014 X 2 - 1
= 4028 - 1
= 4027

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