1/x+9/y=1(x>0,y>0),x+y的最小值?

x>0 y>0 x+y=1,4/X+9/y最小值x>0 y>0 x+y=1,求4/X+9/y最小值 设x大于1,y大于0,x^y+x^-y=2根号二,x^y-x^-y等于? 4x+y-9>=0 ,x-y-1 已知x>0,y>0 x+y+9/x+1/y=10,则x+y则最大值为? mathematica软件,已知y[x],Y=f1(x),X(x)=f2(x),如何plot Y[X]?y[x_] := x + 9.81/2*x*xk=1X[x] = x - k*y'[x]/(1 + (y'[x])^2)^0.5Y[x] = y[x] + k/(1 + (y'[x])^2)^0.5Plot[{y[x],Y[X],},{x,0,2}] 1/x+9/y=1(x>0,y>0),x+y的最小值? x>0y>0且1/x+9/y=1求2x+y最小值 x>0 y>0 x+y=1,4/X+9/y最小值 已知x>0,y>0,x+9y=1求x+y的最小值? 已知x>0y>01/x+9/y=1,求证：x+y>=16.快 若实数x,y满足x-y+1》=0,x+y>=0,x 已知x,y满足约束条件：x-y+1>=0,x+y-2>=0,x 若实数x,y满足x-y+1>=0,x+y>=0,x 画出不等式组x+y>0,x=还有不等式（x-y)(x-y-1)= 实数x,y满足{x-y+1>=0;y+1>=0;x+y+1 X>0 Y>0证1/x+1/y>=4/(x+y)X>0 Y>0 证1/x+1/y>=4/(x+y) y=1/x^2(x>0) y=(1-x)/(1+x) y=(e^x-e^-x)/2 y=1-x^2 x>=0 ,y=sin|x|/x x