若|x+y-5|+(xy-3)2=0,则x2+y2的值为( )
若|x+y-5|+(xy-3)2=0,则x2+y2的值为( )
若|x+y-5|+(xy-6)2=0,则x2+y2的值为______.
已知X2-2x+y2+6y+10=0,求(x2-2xy)/(xy+y2)的值
若x<y<0,则x2−2xy+y2+x2+2xy+y2=( )
x(x-1)-(x2-y)=-3,求x2+y2-2xy的值
若X2+Y2-2X-6Y+10=0 ,求(x2-y2)/xy的值
已知:x=3,y=-5,x2-2xy+y2/x2-y2的值是
已知x2+xy=3,xy+y2=-2,则2x2-xy-3y2的值为( )
已知x2+y2-10x-6y+34=0,求(x-y/x+y)2÷x2-y2/xy×x2+2xy+y2/x2-xy 的值.
已知xy=9,x-y=-3,则x2+3xy+y2的值为( )
已知x2-2xy=3y2且x,y为非零实数 求:(1)2x+y/x-2y (2)2x2-3y2+5xy/x2+xy+y2
已知2x=3y,求xy/(x2+y2)-y2/(x2-y2)的值