Question

Daca ab+ba=187,atunci a+b ce valoare are?​

Answer 1

 

$\displaystyle\bf\\\overline{ab}+\overline{ba}=187\\\\10a+b+10b+a=187\\\\10(a+b)+a+b=187\\\\11(a+b)=187\\\\a+b=\frac{187}{11}\\\\ \boxed{\bf~a+b=17}$