If \(\rm \sqrt {\frac{x}{y}} \, + \,\frac{1}{{\sqrt 2 }}\, = \,\sqrt {\frac{y}{x}} \) ଏବଂ x + y = 18, ତେବେ xy ର ମୂଲ୍ୟ କ’ଣ?
1
80
2
45
3
56
4
72
If \(\rm \sqrt {\frac{x}{y}} \, + \,\frac{1}{{\sqrt 2 }}\, = \,\sqrt {\frac{y}{x}} \) ଏବଂ x + y = 18, ତେବେ xy ର ମୂଲ୍ୟ କ’ଣ?