72 + 48 : ( 3 * 2 )                         ( 1.230 + 600 ) – ( 570 – 70 )

72+48:(3*2)=80 (3*2)=6 48:6=872+8=80 (1 230+600)-(570-70)=1 330 1230+600=1830 570-70=5001830-500=1330