Cho $a, b, c$ là 3 số thực không âm thỏa $a+ b+ c= 2$. Chứng minh rằng:
$\frac{bc}{a^{2}+ 1}+ \frac{ca}{b^{2}+ 1}+ \frac{ab}{c^{2}+ 1}\leq 1$
$\frac{bc}{a^{2}+ 1}+ \frac{ca}{b^{2}+ 1}+ \frac{ab}{c^{2}+ 1}\leq 1$
Started By dai101001000, 25-03-2018 - 20:48
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