x-y=5,xy=2,则x/y+y/x=?

Question

x-y=5,xy=2,则x/y+y/x=?

Answer 1

因为 x - y = 5 , xy = 2
所以 x / y + y / x = (x - y )^2 / (xy) + 2 = 5^2 / 2 + 2 = 29/2