Afla numarul necunoscut din expresi
(9×9_6×6-a)+20=53
(99-b-24)+6=66
(6×4+c)-24=4
(2×3+d)-69=49
(e+5×6)-50+32=42
(96-3×4-5×8=13
[tex]dau corana[/tex]
Dacu coana ​