怎么求f【φ(x)】
2个回答
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f(x)
= x^2 ; x>0
=2 ; x≤0
φ(x)
=x^3 ; x>0
=-x^3 ; x≤0
case 1:x>0
φ(x) = x^3 >0
f(φ(x)) = (x^3)^2 = x^6
case 2: x=0
φ(0) = 0
f(φ(0)) = f(0) = 2
case 3: x>0
φ(x) = -x^3 >0
f(φ(x)) = (-x^3)^2 = x^6
ie
f(φ(x))
= x^6 ; x≠0
=2 ; x=0
= x^2 ; x>0
=2 ; x≤0
φ(x)
=x^3 ; x>0
=-x^3 ; x≤0
case 1:x>0
φ(x) = x^3 >0
f(φ(x)) = (x^3)^2 = x^6
case 2: x=0
φ(0) = 0
f(φ(0)) = f(0) = 2
case 3: x>0
φ(x) = -x^3 >0
f(φ(x)) = (-x^3)^2 = x^6
ie
f(φ(x))
= x^6 ; x≠0
=2 ; x=0
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