已知：x-1/x=3,求：(x^10+x^8+x^+1)/(x^10+x^6+x^4+1)的值 x-1/x=3(x-1/x)^2=x^2+1/x^2-2=9x^2+1/x^2=11 (x+1/x)^2=x^+2+1/x^2=13x+1/x=t,则t^2=13 x^3+1/x^3=(x+1/x)(x^2-1+1/x^2)=(x+1/x)[(x^2+2+1/x^2)-3]=(x+1/x...