Find content
Male
CodeCogsEqn (2).gif 5.8KB
113 downloads
Lại có $\frac{1}{x}+\frac{1}{y}+\frac{1}{z}\geq \frac{9}{x+y+z}$
Mà $\frac{1}{x}+\frac{1}{y}+\frac{1}{z}\leq 3$
suy ra $x+y+z\geq 3$
Vậy min P =$\frac{3}{4}$ khi x=y=z=1
HitCracker
In Topic: cho x,y,z>0 thỏa mãn \sqrt{xy}+\sqrt{xz}+...
25-12-2016 - 19:37
duy.png 138.86KB
42 downloads
In Topic: tìm min P=$\sum \frac{1+b}{1+4a^2}$
12-12-2016 - 19:03
bdt.png 144.4KB
43 downloads
