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afla numarul necunoscut :1020 + ( d - 2021 ) = 4878

Răspuns :

1020+(d-2021)=4878
d-2021=4878-1020
d-2021=3858
d=3858+2021
d=5879
[tex]1~020+(d-2~021)=4~878 \\ d-2~021=4~878-1~020 \\ d-2~021=3~858 \\ d=3~858+2~021\\ \boxed{\bold{d=5~879}}[/tex]