[tex]A=\left(2^{2018\cdot \:5}\right)^{2019+1}=2^{2018\cdot \:5\left(2019+1\right)}=2^{20381800}[/tex]
[tex]B=\left(2^{2016+5}\right)^{2018+1}=2^{\left(2016+5\right)\left(2018+1\right)}=2^{4080399}[/tex]
[tex]A+B = 2^{20381800}+2^{4080399}[/tex]
[tex]A-B = 2^{20381800}-2^{4080399}[/tex]