已知实数XY满足x^2+y^2+2x+4y-20=0求 y/x
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已知实数X.y满足X^2+xy-y^2=0,求x/y的值
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×x+y×y-xy+2x-y+1=0 试求x y的值