已知xx+x-1=0,求xxx+2xx的值

已知XX+X+1=0,求XXX+2XX+2X+3的值 已知xx+x-1=0,求xxx+2xx的值 若xx+x-1,求xxx+2xx+99的值是若xx+x-1=0,求xxx+2xx+99的值 已知xx-2x-1=0,求xxxx-xxx-5xx-7x+5的值拜托各位大神 若xx+x-1=0,求xxx+2xx+99的值 已知xx+x-1=0,求xxx-2x+2012的值 已知x/(xx+x+1)=a,求xx/(xxxx+xx+1)的值 已知xx+yy+4x-6y+13=0,求（xx-2x）/xx+3yy的值. 已知xx+5x-998=0.试求代数式xxx+6xx-993x+1008的值.快点! 已知xx+x-1=0,求:xx+1/xx,xxxx+1/xxxx xxx+xx+x+1求x^ 2008 已知x（x+1)-(xx+y)=3,求(xx+yy)/2-xy的值 若XX+X-1=0,求代数式xxx+zxx-7的值怎么做 (x-2)(xx+mx+n)=xxx+3xx-7x-6,求m与n的值 已知x+x^-1=3求xx+x^-2的值；xxx+x^-3的值不好意思，那3x+3/x怎么消 已知XX-11X+1=0,求下列各式:(1)X+1／X(2)XX+1／XX(3)XX／XXXX+1XX-11X+1=0的意思X乘X减11X加一等于0(1)X+1／X的意思是 X加1分之X(2)XX+1／XX X的平方加1分之X的平方(3)XX／XXXX+1 X的平方分之X的四次方加1 已知：3x=xx-x+1求（xxxx+xx+1）分之xx 已知x+1/x=3,求(xx)/(xxxx+xx+1)的值