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x^2+1/x^2=(x+1/x)^2-2=9-2=7
则x^3+1/x^3=(x+1/x)(x^2-1+1/x^2)=18
[x^(3/2)+1/x^(3/2)]^2=x^3+2+1/x^3=20
所以x^(3/2)+1/x^(3/2)=2根号5或-2根号5
则x^3+1/x^3=(x+1/x)(x^2-1+1/x^2)=18
[x^(3/2)+1/x^(3/2)]^2=x^3+2+1/x^3=20
所以x^(3/2)+1/x^(3/2)=2根号5或-2根号5
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