Problem C. 1301. (September 2015)
C. 1301. Prove that if \(\displaystyle x_1\) and \(\displaystyle x_2\) are positive real numbers, then
\(\displaystyle
(x_1+x_2+1) \left(\frac{1}{x_1}+\frac{1}{x_2}+1\right)\ge 9.
\)
(5 pont)
Deadline expired on 12 October 2015.
Statistics:
199 students sent a solution.  
5 points:  168 students. 
4 points:  11 students. 
3 points:  6 students. 
2 points:  2 students. 
1 point:  5 students. 
0 point:  5 students. 
Unfair, not evaluated:  2 solutions. 
