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47-56:c-11=29

28+72:b+12=48


Răspuns :

Trebuie sa il gasesti pe c si b

47-56:c-11=29
47-x=29+11
47-x=40
x=7
56:c=7
c=56:7
c=8
verificare 47-56:8-11=29   47-7-11=29   40-11=29  29=29

28+72:b+12=48
28+x+12=48
28+x=48-12
28+x=36
x=36-28
x=8
72:b=8
b=9

verificare 28+72:9+12=48   28+8+12=48   36+12=48   48=48