若实数x,y满足1/x-1/y=5,则分式3x-2xy-3y/x+xy-y的值等于?

若正实数x,y满足x+y+1/x+1/y=5,则x+y的最大值是多少 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,y满足x^2+y^2-4x-2y+5=0,则x+y/2x-1 若实数xy满足x-y+1 若实数x,y是满足1 若实数x,y满足x>=1,y>=1,x+y 实数x,y满足x^3-y^3-3xy=1,则x-y= 已知实数x,y满足y=|x-1|若x+2y 已知实数x,y满足y=|x-1|,则x+2y的最大值是 已知变量x,y满足约束条件：x+y≧1,y≦3,x-y≦1,若z=Kx+y最大值为5,则实数k 若实数x,y满足1/x-1/y=5,则分式3x-2xy-3y/x+xy-y的值等于? 若实数x,y满足x2+y2+xy=1,则x+y的最大值是 若实数x,y满足x2+y2+xy=1,则x+y的最大值是 若实数x,y满足x+9y=1,则xy的最大值 若实数x,y满足x|x|+y|y|=1,则点(x,y)到直线x+y=0的距离的取值范围是 若实数X,Y满足X²+Y²+4X-2Y +1=0,则X²-6X+Y²-2Y的最大值是多少 .若实数x,y满足x｜x｜－y｜y｜＝1,则点(x,y)到直线y=x的距离的取值范围是