Ta có :
[tex]A=\frac{(2015^2.2025+31.2016-1)(2015.2020+4)}{2016.2017.2018.2019.2020}[/tex]
[tex]A=\frac{(2015^2.2025+31.2016-1)(2016.2020-2020+4)}{2016.2017.2018.2019.2020}[/tex]
[tex]A=\frac{(2015^2.2025+31.2016-1)(2016.2020-2016)}{2016.2017.2018.2019.2020}[/tex]
[tex]A=\frac{(2015^2.2025+31.2016-1)(2016.2019)}{2016.2017.2018.2019.2020}[/tex]
[tex]A=\frac{2015^2.2025+31.2016-1}{2017.2018.2020}=1[/tex]
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