若2x+y=0则(x2+xy+y2)/(2xy-x2)的值
若X2+Y2-2X-6Y+10=0 ,求(x2-y2)/xy的值
已知2x-3*根号(xy)-2y=0(x>0),则x2+4xy-16y2除以2x2+xy-9y2的值是多少?
已知X2-2x+y2+6y+10=0,求(x2-2xy)/(xy+y2)的值
已知2x=3y,求xy/(x2+y2)-y2/(x2-y2)的值
若x<y<0,则x2−2xy+y2+x2+2xy+y2=( )
若x2-2xy-y2-x+Y-1=0 求x-y的值
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:x=3,y=-5,x2-2xy+y2/x2-y2的值是
正数xy满足x2-y2=2xy,求x+y分之x-y的值
已知x、y是实数且满足x2+xy+y2-2=0,设M=x2-xy+y2,则M的取值范围是______.
已知X2+Y2+8X+6Y+25=0 求代数式X2++XY+4Y2分之X2-4Y2 减X+2Y分之X的值
一. 若x2+y2+2x-6y+10=0,求xy的值.