Caz 1: a+b+c
Maria are 3 mere, 4 pere si mai primeste 5 caise. Cate fructe are in total Maria.
3+4+5=12 fructe
Caz 2: a+(b+c)
Maria are 3 nuci, insa mai primeste de la Ioana 4 nuci si de la Ionel 5 nuci. Cate nuci are in total Maria.
3+(4+5)=3+9=12 nuci