1/x=√5,则x^2+1/x^2 =_____________

1/x=√5,则x^2+1/x^2 =_____________
1/x=√5,则x^2+1/x^2 =_____________

1/x=√5,则x^2+1/x^2 =_____________
【初二数学题】若x+ 1/x=√5,则x^2+1/x^2 =(x+1/x)²-2=5-2=3;
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