已知x.y满足（x-y+2＞＝0.x+y-4＞＝0.2x-y-5＜＝0）,求Z=[x+2y-4]的最大值……补充：[]为绝对值符号…

已知x,y满足y 已知实数x,y满足x-y 已知实数X,Y满足{|x+y| 已知实数x.y满足(x+2)^2+y^2( 已知圆x,y满足x^2+y^2 已知x,y满足x+y-2>=0,2x-y+2>=0,x 已知x,y满足约束条件：x-y+1>=0,x+y-2>=0,x 已知x.y满足X2-y2=2xy.则x-y/x+y=?x. 已知实数x,y满足：y 已知实数x,y满足约束条件x+y>3,y 已知x.y满足（x-y+2＞＝0.x+y-4＞＝0.2x-y-5＜＝0）,求Z=[x+2y-4]的最大值……补充：[]为绝对值符号… 已知实数x,y满足方程x^2+y^2-4x-2y+1=0.求x^2+y^2+x+y的最大值和最小值. 已知x,y满足{x>=1,x+y 已知x,y满足{x>=1,x+y 已知x和y满足x＋3y＋|3x－y|＝19,2x＋y＝6,求x,y的值 已知实数x,y满足x²+√2 y=√3,y²+√2 x＝√3,则x/y+y/x=? 已知实数X,Y满足2 已知实数xy满足x+2y