(x+(1/x))^2=36x^2+2+(1/x^2)=26(x^2)+(1/x^2)=34
把X+1/X=6两边分别平方得: (x^2)+(1/x^2)+2=36 (x^2)+(1/x^2)=34
34(x+(1/x))^2=36 即 (x^2)+(1/x^2)+2=36所以 (x^2)+(1/x^2)=34