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

Răspuns :

 

[tex]\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}[/tex]