Răspuns :
Explicație pas cu pas:
a+b=2020
a=b+764
=> 2b+764=2020
2020-764=1256
2b=1256 => b=628
a=b+764
a=628+764=1392
a=b+764
a+b=2020
b+764+b=2020
2b=2020-764
2b=1256
b=1256:2
b=628
a=628+764
a=1392
a+b=2020
b+764+b=2020
2b=2020-764
2b=1256
b=1256:2
b=628
a=628+764
a=1392