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Efectuati: 13-3x8=; 53+14:7-5x7=; 18x3-19-34:17=; 72:6+13-13x2+1=.

Răspuns :

13-3x8=13-24= - 11

53+14:7-5x7=53+2-35=55-35=20

18x3-19-34:17=54-19-2=54-21=33

 72:6+13-13x2+1=12+13-26+1=25-26+1=0

13-24=-11
53+14:7-5x7=53+2-35=55-35=20
18x3-19-34:17=54-19-2=33
72:6+13-13x2+1=12+13-26+1=-1+1=0