Question

Sabendo qud x+y=1 e xy=1/2,qual o resultado de y/x + x/y?

Answer 1

Veja que

$\frac{y}{x}+\frac{x}{y}=\frac{x+y}{xy}=\frac{1}{\frac{1}{2}}=2$

Answer 2

RESOLVENDO
Y/X+X/Y=Y²+X²/XY= 1²/1/2=2