若x,y满足：0

若x,y满足：0 若x、y满足0 若x,y满足y 若实数x,y满足x-y+1》=0,x+y>=0,x 若实数x,y满足x-y+1>=0,x+y>=0,x 若实数x满足条件x>=0,y 若实数x,y满足不等式组x>=0 ,y>=0,x+2y 若x.y满足条件2x+y-12=0,x-4y+10 若正整数X,Y满足2X+Y--XY=0,求X+Y的最小值 若实数x,y满足x^2-xy-y^2 =0,则x/y=? 若实数x,y满足y 若实数x,y满足不等式y 若实数x,y满足x 若实数x,y满足x 若x,y满足约束条件,x>=0,y>=0,x-y>=-1,3x+4y 若实数x,y满足x²+y²-2x+4y=0,求x-y的最大值 若x,y满足|x-y+1|+(x+y+3)^2=0则x^2-y^2= 若x y满足x^2+y^2-2x+4y=0求x-2y的最大值