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
已知实数xy满足x2+y2-4x+3=0则(x+y-3)/(x-y+1)的取值范围是
设实数x,y满足x2+y2=1则 xy的取值范围是?
已知实数xy满足x2+y2=4.则y+3/x+1的取值范围为
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=4.则3x+4y的取值范围是
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+2xy+3y2-8y+6=0,求x,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
已知实数x,y满足x2+xy+y2=3,则x2-xy+y2的最小值
已知实数x,y满足:x2+3y2-3=0,求x+y的取值范围.
已知x,y满足x2/9+y2/4=1,则xy的取值范围是?
已知实数x,y满足x2+y2+4x+3=0,求(y-2)/(x-1)的取值范围.