Resposta :
Resposta:
{B+C=85
{2B+3C=140
c=85-B
2B+3×(85-B)=140
2B+255-3B=144
-B=144-255
-1×(-B=-115)
B=115
c=85-115=-30
30+B=85
B=55 C=
Resposta:
{B+C=85
{2B+3C=140
c=85-B
2B+3×(85-B)=140
2B+255-3B=144
-B=144-255
-1×(-B=-115)
B=115
c=85-115=-30
30+B=85
B=55 C=