Cho x,y,z>0.: x+y+z=1. Tìm Min C=(x+1/x)^2+(y+1/y)^2+(z+1/z)^2
Cho x,y,z>0.: x+y+z=1. Tìm Min C=(x+1/x)^2+(y+1/y)^2+(z+1/z)^2
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Cho x,y,z>0.: x+y+z=1. Tìm Min C=(x+1/x)^2+(y+1/y)^2+(z+1/z)^2