已知实数x,y满足x2+2xy+3y2-8y+6=0,求x,y的取值范围
已知实数x,y满足x2+2xy+3y2-8y+6=0,求x,y的取值范围
已知实数x,y满足x2+y2-4x+1=0,求2x+y的取值范围?
已知实数x,y满足x2+y2=4,求x+y的取值范围
设实数xy满足x2 +2y2=6,则x+y的取值范围
已知实数XY 满足X2+Y2=1,求Y+2/X+1的取值范围
已知实数x,y满足:x2+3y2-3=0,求x+y的取值范围.
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
已知实数xy满足x2+y2-4x+3=0则(x+y-3)/(x-y+1)的取值范围是
已知非零实数x,y满足:x2+xy-2y2=0,求(x2+3y+y2)/(x2+y2)的值