由f(x+2)= -f(x),则f(x)=-f(x-2)
f(7.5)=-f(7.5-2)=-f(5.5)=f(3.5)=-f(1.5)=f(-0.5)
又它为奇函数,f(-0.5)=-f(0.5)
又当x大于等于0小于等于1时,f(x)=x,故
f(7.5)=-f(0.5)=-0.5 由f(x+2)= -f(x),则f(x)=-f(x-2)
f(7.5)=-f(7.5-2)=-f(5.5)=f(3.5)=-f(1.5)=f(-0.5)
又它为奇函数,f(-0.5)=-f(0.5)
又当x大于等于0小于等于1时,f(x)=x,故
f(7.5)=-f(0.5)=-0.5