1.已知x+1/x=3,求[x/(xx-2x+1)]+[x/(2xx-2x+2)]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x+x^-1=3求xx+x^-2的值;xxx+x^-3的值
已知xx+yy+4x-6y+13=0,求(xx-2x)/xx+3yy的值.
已知x/(xx+x+1)=a,求xx/(xxxx+xx+1)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-5X+1=0,求X*X+1/XX的值
解方程1/(xx+x)+1/(xx+3x+2)+1/(xx+5x+6)+1/(xx+7x+12)+1/(xx+9x+20
已知x+1/x=3,求(xx)/(xxxx+xx+1)的值
已知2x=3y,求xy/xx+yy-yy/xx-yy的值
小数奥数网xx(x +1)x(x+ 2)x(x +3)=360怎样算?