Respostas

A melhor resposta!
2014-03-05T11:58:28-03:00
X=12/y
X+y=13
12/y+y+13
12+y²=13y
y²-13y+12=0
Δ=169-48
Δ=121
y=13+-√121/2
y=13+-11/2
y1=13+11/2=24/2=12
y2=13-11/2=2/2=1
x1=12/12=1
x²y+xy²=1²*12+1*12²=12+144=156

2 3 2