Respuesta :

Answer:

16160

Step-by-step explanation:

(2021#2020)= [tex]2021^2-2020^2=4041[/tex]

(2020#2019)=[tex]2020^2-2019^2=4039[/tex]

finally, (2021#2020)#(2020#2019)= [tex]4041^2-4039^2=16160[/tex]