x的平方-13x+1=0两边乘以x,得x-13+1/x=0∴x+1/x=13x³+1/x³=(x+1/x)(x²-1+1/x²)=(x+1/x)[(x+1/x)²-3]=13×(13²-3)=2158x+1/x=13两边平方得x²+2+1/x²=169x²+1/x²=1...