Cho $a;b;c\geqslant 0$ thỏa mãn $ab+bc+ca=1$ . Chứng minh rằng $\frac{(1+a^{2})^{2}}{b^{2}+c^{2}}+\frac{(1+b^{2})^{2}}{c^{2}+a^{2}}+\frac{(1+c^{2})^{2}}{a^{2}+b^{2}}\geqslant 8$
$\frac{(1+a^{2})^{2}}{b^{2}+c^{2}}+\frac{(1+b^{2})^{2}}{c^{2}+a^{2}}+\frac{(1+c^{2})^{2
Started By trungdung19122002, 01-03-2017 - 14:46
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Posted 01-03-2017 - 14:46
trungdung19122002
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