Cho a,b,c > 0, ab+bc+ca=1
CM: $\frac{1}{4a^{2}-bc+1} + \frac{1}{4b^{2}-ac +1} +\frac{1}{4c^{2}-ab+1}\leq \frac{3}{2}$
BĐT
Started By quynhanhlh7, 22-10-2018 - 08:53
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