x^2-3x+1=0把x=0代入,1=0不成立所以x不等于0方程左右同除以xx-3+1/x=0x+1/x=3(x+1/x)^2=x^2+2*x*1/x+1/x^2=x^2+2+1/x^2=9所以x^2+x^(-2)=x^2+1/x^2=7(x^2+1/x^2)^2=x^4+2+1/x^4=7^2x^4+x^(-4)=x^4+1/x^4=47...