URGENT ex 3❗️⭐️⭐️⭐️⭐️

Răspuns:
[tex]10a+b=2(a+b)\\\\10a+b=2a+2b\\\\10a-2a=2b-b\\\\8a=b= > b=8;a=1\\\\nr.ab-este.18\\\\verificare:\\\\2(1+8)= > 9*2=18[/tex]