求方程5x2+5y2+8xy+2y-2x+2=0的实数解.
已知非零实数x,y满足:x2+xy-2y2=0,求(x2+3y+y2)/(x2+y2)的值
已知实数x,y满足(x2)+(y2)-xy+2x-y+1=0,求x,y的值
已知实数x、y满足X2+y2-xy+2x-y+1=0,试求x、y的值
已知实数x、y满足2x2-7xy+3y2=0,求x:y
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
若X2+Y2-2X-6Y+10=0 ,求(x2-y2)/xy的值
设x,y为实数,代数式5x2+4y2-8xy+2x+4的最小值为______.
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
已知2x=3y,求xy/(x2+y2)-y2/(x2-y2)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______.
(xy-6)2+/x+y-5/=0 求x2+y2的值
设为实数x、y,求x2+2xy+2y2-4y+5的最小值,并求出此时x与y的值.