Răspunsuri

2014-11-01T12:36:17+02:00
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;
de unde ai aflat ca a- c = 50 ????
in A+B = 86 , am inlocuit B cu 136 - c si aveam A+136-C = 86 ==> A-C = 86 - 136 ==> A-C = -50
2014-11-01T12:37:31+02:00
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