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Răspuns :

(ab)^2=b^2+5460
(10a+b)^2=b^2 + 5460
100a^2+20ab+b^2=b^2+5460
20a(5a+b)=5460
a(5a+b)=273=7 x 39
a=7
5a+b=39 ⇒ b=4
ab=74
(ab)²=b²+5460
(10a+b)²=b²+ 5460
100a²+20ab+b²=b²+5460
20a(5a+b)=5460
a(5a+b)=273=7 x 39
a=7
5a+b=39 ⇒ b=4
ab=74