已知x^1/2+x^-1/2=3则x^2+x^-2=

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已知x^1/2+x^-1/2=3则x^2+x^-2=已知x^1/2+x^-1/2=3则x^2+x^-2=已知x^1/2+x^-1/2=3则x^2+x^-2=平方得x+1/x+2=9x+1/x=7平方x

已知x^1/2+x^-1/2=3则x^2+x^-2=
已知x^1/2+x^-1/2=3则x^2+x^-2=

已知x^1/2+x^-1/2=3则x^2+x^-2=
平方得x+1/x+2=9
x+1/x=7
平方x^2+x^-2+2=49
x^2+x^-2=47