第二题怎么做 求过程 最好手写
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f(x)
=x^2+1 ; x≤1
=2/x ; x>1
case 1: x=0
f(0) =1
f(f(0)) = f(1) = 1+1=2
case 2: x<0 or 0<x≤1
f(x) = x^2 +1 > 1
f(f(x)) = 2/(x^2 +1)
case 3: 1<x<2
f(x)= 2/x >1
f(f(x)) = 2/(2/x) = x
case 4: x≥2
f(x) = 2/x <1
f(f(x)) = (2/x)^2+1
=x^2+1 ; x≤1
=2/x ; x>1
case 1: x=0
f(0) =1
f(f(0)) = f(1) = 1+1=2
case 2: x<0 or 0<x≤1
f(x) = x^2 +1 > 1
f(f(x)) = 2/(x^2 +1)
case 3: 1<x<2
f(x)= 2/x >1
f(f(x)) = 2/(2/x) = x
case 4: x≥2
f(x) = 2/x <1
f(f(x)) = (2/x)^2+1
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