Let f (x) = x & # 178; - x + a (a > 0), if f (m)

Let f (x) = x & # 178; - x + a (a > 0), if f (m)

[answer] a
[analysis]
f(x)=(x-0.5)^2-0.25+a
The axis of symmetry is x = 0.5
Because f (m) 0
So 0