已知xx-2x-1=0,求xxxx-xxx-5xx-7x+5的值拜托各位大神

已知xx-2x-1=0,求xxxx-xxx-5xx-7x+5的值拜托各位大神 已知xx-5x+1=0,求xxxx+1／xx的值 已知x/(xx+x+1)=a,求xx/(xxxx+xx+1)的值 已知XX+X+1=0,求XXX+2XX+2X+3的值 已知xx+x-1=0,求:xx+1/xx,xxxx+1/xxxx x+xx+xxx=xxxx 已知x+1/x=3,求(xx)/(xxxx+xx+1)的值 已知：3x=xx-x+1求（xxxx+xx+1）分之xx 已知xx+5x-998=0.试求代数式xxx+6xx-993x+1008的值. 求一道数独题的答案XX7 XXX XX1 9XX XXX 6286X2 XXX 59XXXX X81 XX5X7X 5X 已知x+x^-1=3求xx+x^-2的值；xxx+x^-3的值 已知X*X-5X+1=0,求X*X+1/XX的值