hngmcute

Cho $x,y,z>0$ thỏa mãn $x+y+z=3$

Tìm gtnn $P=$ $\frac{1}{2xy^2+1}+\frac{1}{2yz^2+1}+\frac{1}{2zx^2+1}$

cho $x,y,z >0$ tm $xy+yz+zx=1$
tìm gtnn $(x+y+z)(\sqrt{xy}+\sqrt{yz}+\sqrt{zx})$

Tìm GTNN $P=2\sqrt{9x^2-6x+2}+3\sqrt{4x^2+4x+2}$