C
cbtruong


Cho x,y,z dương thỏa mãn x+y+z=1.
CMR:$\sqrt{x+yz}+\sqrt{y+zx}+\sqrt{z+xy}$\geq $1+\sqrt{xy}+\sqrt{yz}+\sqrt{zx}$
CMR:$\sqrt{x+yz}+\sqrt{y+zx}+\sqrt{z+xy}$\geq $1+\sqrt{xy}+\sqrt{yz}+\sqrt{zx}$