已知x,y满足x²+y²+4x-2y=0.求x²+y²的取值范围
已知实数x,y满足x²+4y²=4x,求x+y的取值范围
已知实数x,y满足x²+y²=1.求x²-4x+y²+2y的取值范围,求详解,
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+y²-2y=0,(1)求2x+y的取值范围
已知x²+y²-2x+4y=0,求x+3y的取值范围?
已知实数x,y满足x²+y²-4x+1=0,求y-x的取值范围
已知非零有理数x,y满足x²-4xy+4y²=0,求x-y/x+y-y-x/x+y的值.
已知实数x,y满足x²+2xy-1=0,求x+y的取值范围.当0≤x≤4时,求y=根号x-x的最大值和最小值.
已知x,y的值满足方程组x+2y=3,x-y=-2,求x/(x-y)²+x²-y²/(x+
已知实数x,y满足x²+4y²=16,则x+2y的取值范围是
已知实数x,y满足x²+y²=9(y≥0)试求m=(y-3)/(x+1)及b=2x+y的取值范围
设x,y为实数,且满足5x²+4y²=10x,求x²+y²的取值范围.