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A+B=90
A+C=79
B+C = 97
Sa se afle numerele va rooog


Răspuns :

2A+2B+2C=90+79+97
2A+2B+2C=266
A+B+C=266:2
A+B+C=133
A+B=90 rezulta ca
90+C=133
C=133-90
C=43
B+C=97
A+97=133
A=36
36+B+43=133
B=133-79
B=54
Verificare: 36+54+43=133
A + B + A + C + B + C = 90 + 79 + 97
2A + 2B + 2C = 266
2 ( A + B + C ) = 266   | :2
A + B +C = 133 
90 + C = 133 => C = 133 -90 => C = 43
A + C = 79 => A + 43 = 79 => A = 79 - 43 => A = 36
B + C = 97 => B + 43 = 97 => B = 97 - 43 => B = 54