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