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28+72:b+12=48 b)47-56:c-11=29 c) (56+16:2):8+d=18


Răspuns :

72:b+12=48-28
72:b+12=20
72:b=20-12
72:b=8
b=72:8
b=9                                       
  

b) 47-56:c=29+11
47-56:c=40
56:c=47-40
56:c=7
c=56:7
c=8
      
c)(56+8):8+d=18
64:8+d=18
8+d=18 
d=18-8
d=8
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