hasil dari,beri caranya ya

≡ Sifat yang dipakai:
[tex]\Leftrightarrow a^{2}-b^{2}=(a+b)(a-b)[/tex]

≡ Penyelesaian:
[tex]\Rightarrow \frac{2017 \times (2016^{2}-4^{2}) \times 2015}{2020 \times (2016^{2}-1^{2})} \\ \Rightarrow \frac{2017 \times [(2016+4)(2016-4] \times 2015}{2020 \times [(2016+1)(2016-1)]} \\ \Rightarrow \frac{2017 \times 2020 \times 2012 \times 2015}{2020 \times 2017 \times 2015} \\ \leadsto \boxed{2012}[/tex]