Given that the function defined on (0, -∞) satisfies f (x, y) = f (x) + F (y), and if x > 1, f (x) < 0, if f (half) = 1, find the solution set of the inequality f (x) + F (5-x) ≥ - 2 Is f (XY) = f (x) + F (y)

f(x,y)=f(x)+f(y)
Is this a function of one variable or a function of two variables?
If f (x, y) is such an expression, the function f has two variables
If f (x) and f (y) are expressed in this way, the function f has only one variable
How many variables does F have?

Given that the function defined on (0, -∞) satisfies f (x, y) = f (x) + F (y), and if x > 1, f (x) < 0, if f (half) = 1, find the solution set of the inequality f (x) + F (5-x) ≥ - 2 Is f (XY) = f (x) + F (y)

Given that the function defined on (0, -∞) satisfies f (x, y) = f (x) + F (y), and if x > 1, f (x) < 0, if f (half) = 1, find the solution set of the inequality f (x) + F (5-x) ≥ - 2 Is f (XY) = f (x) + F (y)

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