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afla numerele a,b c, stiind ca. a+b+c=21 a+b=13 b+c=9 b). a+b+c=27 a+b=16 b+c=13

Răspuns :

C=21-13
C=8
B+8=9
B=9-8
B=1
A+1=13
A=13-1
A=12
VERIFICARE  12+1+8 =21