x-1/x=3,求xx+1/xx的值因为平方打不来,XX代表X的平方,哪位仁兄帮个忙算下吧...步骤写清楚些,理由要充分...

已知x/(xx+x+1)=a,求xx/(xxxx+xx+1)的值 己知x-1/x=-3,求xx-1/xx的值. 已知x+1/x=3,求(xx)/(xxxx+xx+1)的值 已知XX+X+1=0,求XXX+2XX+2X+3的值 已知x（x+1)-(xx+y)=3,求(xx+yy)/2-xy的值 x(x+1)-(xx+y)=-3,求(xx+yy)/2-xy的值 已知：3x=xx-x+1求（xxxx+xx+1）分之xx 若xx-4x+1=0,求①x+1/4的值；②xx+1/xx的值 x-1/x=3,求xx+1/xx的值因为平方打不来,XX代表X的平方,哪位仁兄帮个忙算下吧...步骤写清楚些,理由要充分... 若xx+x-1,求xxx+2xx+99的值是若xx+x-1=0,求xxx+2xx+99的值 7/xx+x+1/xx-1=2/xx-x 已知xx+x-1=0,求xxx+2xx的值 若xx+x-1=0,求xxx+2xx+99的值 x/xx+x+1=1/4 求xx/xxxx+xx+1 已知xx+yy+4x-6y+13=0,求（xx-2x）/xx+3yy的值. 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xx+x-1=0,求:xx+1/xx,xxxx+1/xxxx 已知x(x-1)-(xx-y)=-3求xx+yy-2xy