Let a=1-x, b=1-y, c=1-z. a+b+c=2. a, b, c>0.
Original left=sqrt(ab)+sqrt(bc)+sqrt(ac)<=(a+b)/2+(b+c)/2+(a+c)/2=2
= hold when a=b=c, ie. x=y=z=1/3
Let a=1-x, b=1-y, c=1-z. a+b+c=2. a, b, c>0.
Original left=sqrt(ab)+sqrt(bc)+sqrt(ac)<=(a+b)/2+(b+c)/2+(a+c)/2=2
= hold when a=b=c, ie. x=y=z=1/3
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