Question

a+b=45.A-b=11.Sa se determine cele doua numere

Answer 1

a+b+a-b=45+11
2a=56
a=56:2
a=28
b=45-28=17

Answer 2

$\left \{ {{a+b=45} \atop {a-b=11}} \right. \\ ===== \\\\ 2a/=56 \ \ \ |:2 \\\\ \boxed{a=28} \\\\ a+b=45 \\\\b=45-28 \\\\ \boxed{b=17}$