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Aflati nr necunoscut
(245:5+5×x):9+89=100


Răspuns :

(245:5+5 ori x):9 +89=100
(245:5+5 ori x):9 =100-89= 11
49+ 5x =11 ori9=99
5x= 99-49=50=> x =50:5 = 10 ( coronita)