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=1.求x²-4x+y²+2y的取值范围,求详解,
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+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
已知实数x,y满足x²+y²-4x+1=0,求y-x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+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.
已知实数x,y 满足x^2+y^2=1,求(y-2)/(x+1)的取值范围
已知实数x,y满足x^2+y^2=1,求(y+2)/(x+1)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.
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=9(y≥0)试求m=(y-3)/(x+1)及b=2x+y的取值范围