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Cho ba số a,b,c khác 0. Chứng minh rằng:

lớp 11

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supernatural1

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Cho ba số a,b,c khác 0. Chứng minh rằng:

$ \frac{a^{2}+3bc}{b^{2}+c^{2}}+\frac{b^{2}+3ca}{c^{2}+a^{2}}+\frac{c^{2}+3ab}{a^{2}+b^{2}} \geq 0 $

Edited by supernatural1, 27-10-2017 - 19:34.






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