已知实数x,y满足关系:x2+y2-2x+4y-20=0(1)求x2+y2的范围(2)x/y的范围
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
已知实数x,y满足x2+y2+4x+3=0,求(y-2)/(x-1)的取值范围.
已知实数x.y满足(x2+y2)(x2+y2-1)=2,求x2+y2的值
已知实数x,y满足x2+y2+4x+3=0,求x-1分之y-2的取值范围
实数x,y 满足x2+y2-2x-4y+1=0,求y/(x+2)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满足方程x2加 y2-2x加4y等于0,求x减2y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.
已知实数x,y满足x2+y2-2x+4y=0,则x2+y2的最小值是
已知实数x,y满足关系:x2+y2-2x+4y-20=0,则x2+y2的最小值30-10530-105.
已知实数x,y满足x2+y2+4x+3=0,求(y-2)/(x-1)的值域.