Răspuns :
{12+3x[20-2x(7-2)]+13}x10=
[12+3x(20-2x5)+13]x10=
[12+3x(20-10)+13]x10=
(12+3x10+13)x10=
(12+30+13)x10=
55x10=550
[12+3x(20-2x5)+13]x10=
[12+3x(20-10)+13]x10=
(12+3x10+13)x10=
(12+30+13)x10=
55x10=550
da 550 eu am avut acest exercitiu la scoala si stiu ca trebuie de facut fiecare p[aranteza da 550