Cho $ab+bc+ca=\frac{1}{3}$ và a,b,c dương. Chứng minh: $\sum \frac{1}{a^2-bc+1}\leqslant 3$
Chứng minh: $\sum \frac{1}{a^2-bc+1}\leqslant 3$
Started By alexander123, 16-12-2021 - 15:15
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Posted 16-12-2021 - 15:15
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