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daca la produsul nr.asi7adaugam catulnr 56si 9 obtinem nr.69 afla nr a

Răspuns :

a*7+54:9=69
7a=69-6
7a=63
a=63:7
a=9
a×7)+(54:9)=69 a×7+6=69 ax7=69-6 a×7=63 a=63:7 a=9