Cho a,b,c dương
CMR: $$2^{a+b}+2^{b+c}+2^{c+a} \leq 2^{a+b+c}+1$$
______________________________
p/s:
Đặt $2^a=x,2^b=y,2^c=z$
BDT $\Leftrightarrow$ $2xyz-xy-yz-zx+1 \geq 0$
......
CONTINUE....
Cho a,b,c dương
CMR: $$2^{a+b}+2^{b+c}+2^{c+a} \leq 2^{a+b+c}+1$$
______________________________
p/s:
Đặt $2^a=x,2^b=y,2^c=z$
BDT $\Leftrightarrow$ $2xyz-xy-yz-zx+1 \geq 0$
......
CONTINUE....
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