Afla nr necunoscut: (12•10+21-77:7)+a=1048

Răspuns :

Salut,

(12•10+21-77:7)+a = 1048
(120+21-11)+a = 1048
(141-11)+a = 1048
130+a = 1048
a = 1048-130
a = 918.


Succes!
(12•10+21-77:7)+a=1048
( 120 + 21-11) +a = 1048 
130 + a = 1048
a = 1048 - 130 
a = 918