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-2x-1=0,求xxxx-xxx-5xx-7x+5的值拜托各位大神
已知x+x^-1=3求xx+x^-2的值;xxx+x^-3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.
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
已知xx-5x+1=0,求xxxx+1/xx的值
已知xx+x-1=0,求:xx+1/xx,xxxx+1/xxxx
已知x+1/x=3,求(xx)/(xxxx+xx+1)的值
xxx+xx+x+1求x^ 2008