x+1/x=3则x/(x^2+1)=x+1/x=3则x/(x^2+1)=
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x+1/x=3则x/(x^2+1)=x+1/x=3则x/(x^2+1)=x+1/x=3则x/(x^2+1)=x+1/x=3则x/(x^2+1)=x+1/x=3则x/(x^2+1)=x+1/x=3则x/
x+1/x=3则x/(x^2+1)=x+1/x=3则x/(x^2+1)=
x+1/x=3则x/(x^2+1)=
x+1/x=3则x/(x^2+1)=
x+1/x=3则x/(x^2+1)=x+1/x=3则x/(x^2+1)=
解析
x+1/x=3
∴x^2+1=3x
x/(x^2+1)
=x/3x
=1/3
1/3
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