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ajutor!
28+72:b+12=48


47-56:c-11=29

(56+16:2):+d=18


Răspuns :

28 + 72 : b = 48 - 12
72 : b = 36 - 28
72 = 8 b
b = 72 : 8
b = 9
47 - 56 : c = 29 + 11
- 56 : c = 40 - 47
- 56 = - 7c
c = 56 : 7
c = 8
(56 + 8) : 8 + d = 18
64 : 8 + d = 18
d = 18 - 8
d = 10