已知实数xy满足(x^2+y^2)(x^2+y^2-1)=2
已知实数xy满足x+2y
已知实数x,y满足x²+y²-xy+2x-y+1=0 求x y
已知实数xy满足x²﹢y²-xy+2x-y+1=0求xy
已知实数xy,满足10x²-2xy+y²+6x+1=0,求x+y
已知正实数xy满足x+y=1,求1/(2x+y) +4/(2x+3y)最小值
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x^2+y^2=1 求(1-xy)(1+xy)的最大值和最小值
已知x y都是实数 且满足x^2+y^2+xy=1/3,求xy的最大值
已知实数x,y满足5x²+2y²+1=6xy+4x-2y,则x²-xy+2000y
已知实数x y满足x×x+y×y-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