y=x+9/x设0

y=x+9/x设0 设Z=X+Y,其中X,Y满足X+2Y>=0,X-Y 设y=(2+x)^x,(x>0) ,求dy 设随机变量(X,Y)服从G={(x,y)|0 设(X,Y)服从区域G={(x,y)/0 设随机变量（X,Y)~f(x,y)=1,0 设随机变量(X.Y)～f(x,y)=1,0 设y=x^(sinx) x>0 求y` 设A={(x,y)/x+y 设M={(x,y)||x|+|y| 设实数x,y满足 x>=0 x-2y>=0 x-y-2 设x、y满足条件x-y+5>=0,x+y>=0,x 设x,y满足约束条件x>=0 x>=y 2x-y 设x,y满足约束条件{x>=0,y>=x,4x+3y 设x,y满足约束条件x>=0 y>=x 4x+3y 设x大于1,y大于0,x^y+x^-y=2根号二,x^y-x^-y等于? 设：y=e^x(0 设集合A={(x,y)/0