Question

A+B = 86  B + C = 136    A+C = 194    aflati nr .

Answer 1

A + B = 86
B + C = 136 ==> B = 136 - C
A + C = 194

$A - C = -50 \\ A+C =194 \\ -------(+) \\ 2A = 144 ==> A = 72 \\ \\ 72 + B = 86 \\ B = 86 - 72 = 14 \\ \\ 72+C =194 \\ C=194-72=122 \\ \\ R: A=72,B=14,C=122;$

Answer 2

Păi
A+B+B+C+A+C=2xA+2xB+2xC= 86+136+194= 86+330=416
Daca 2xA+2xB+2xC=416 => A+B+C= 416:2=208
A+B+C-A+B=C => 208-86= 122 (C)
B+C-C=B => 136-122= 14 (B)
A+C-C=A => 194-122= 72 (A)
VERIFICARE : 122+14+72= 208