x²-12xy+36y²=0,则x-5y/x+5y

已知x²+y²-2x+4y+5=0,求X^4-y^4/2x^2+xy-y²·2x-y/xy 已知x+y=5,xy=3,x³+y³=(x+y)(x²-xy+y²),则1/x& 若x-y=1,xy=5,则x²y-xy²=? 已知x²-4x+y²-2y+5=0则xy= 若方程 ;x²-5xy+6y²=0,则x/y= 已知x²-5xy+6y²=0,则y比x等于 已知(x-3)²+|y+5|=0,则xy-y^x=__________ 已知x-y=3xy,且xy不等于0,则-3x+6xy+3y/(7x-5y)-9xy-(3x-y) 已知实数x,y满足5x²+2y²+1=6xy+4x-2y,则x²-xy+2000y 若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y* 已知x²+y²-8x+6y+25=0,求（x-y+4xy/x-y）（x+y-4xy/x+y） x²/xy-x/y