
403/(2013*2024) 403/(2014*2015)简便计算
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403/(2013*2024)+ 403/(2014*2015)
=403×(1/2013-1/2024+1/2014-1/2015
=403×(1/2013-1/2015)
=403/2013-1/5
=2/10065
=403×(1/2013-1/2024+1/2014-1/2015
=403×(1/2013-1/2015)
=403/2013-1/5
=2/10065
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