求方程XX-XY-5X+5Y-1=0

已知x,y是实数,且适合方程(xx+xy-12)(xx+xy-12)+(xy-2yy-1)(xy-2yy-1)=0求x, 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 知x/3=y/4=z/5,求(xy+yz+xz)/xx+yy+zz x+y+z=5,xx+yy+zz=6,求xy-xz-yz的解 求方程5X^5-6xy+2y^2-4x+2y+1=0 求方程5x²+6xy+2y²-4x+2y+1=0的实数根 已知xx+y=5,xy=-3,则x^2y+xy^2= 已知x-y=5,y-z=4,求xx+yy+zz-xy-yz-xz的值 若实数XY满足方程X²-XY-2Y²+5x-4y+6=0试求x²+y²的最小值 已知关于x,y方程5x^2-3xy+1/2y^2-2x+1/2y+1/4=0求它的实数根 已知关于x,y方程5x^2-3xy+1/2y^2-2x+1/2y+1/4=0求它的实数根.