Let f (x) be an odd function on R, and f (x + 2) = - f (x). When 0 ≤ x ≤ 1, f (x) = x, then f (4.5) is equal to?

Let f (x) be an odd function on R, and f (x + 2) = - f (x). When 0 ≤ x ≤ 1, f (x) = x, then f (4.5) is equal to?

f(4.5)=f(2.5+2)=-f(2.5)
=-f(0.5+2)=f(0.5)=0.5.