(30+3)*6+7*4=33*6+28=198+28=226
30+3*(6+7)*4=30+3*42*4=30+126*4=30+504=534
(30+3)*(6+7)*4=33*13*4=429*4=1716
Odpowiedź:
(30)+3•6+7•4. 30+(3•6)+7•4. 30+3•6+(7•4)