若xx+yy-2x-6y+10=0,求分式(xx-yy)/xy的值.
已知2x=3y,求xy/xx+yy-yy/xx-yy的值
已知xx+yy+4x-6y+13=0,求(xx-2x)/xx+3yy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 xx-2x+yy+6y+10=0 求x+y的值
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,
若(xx)+(yy)-4x+6y+13=0,求2x+3y的值?
x+y+z=5,xx+yy+zz=6,求xy-xz-yz的解
已知(XX+YY—2)(XX+YY)=3,求XX+YY
已知(x+y)(x+y)=25,(x-y)(x-y)=9求xy与xx+yy的值
已知X+Y+Z=1,且XY+YZ+XZ=0,求XX+YY+ZZ的值?
x,y为实数,且XX+YY/2+4≤XY+2Y求X,Y的值