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aaachacha3110
2 năm trước
Cho a,b,c dương sao cho abc=1 Chứng minh rằng: $\frac{a^{2}b^{2} }{a^{7}+a^{2}b^{2}+b^{7}}$+$\frac{b^{2}c^{2}}{b^{7}+b^{2}c^{2}+c^{7}}$+ $\frac{c^{2}a^{2}}{c^{7}+c^{2}a^{2}+c^{7}}$ $\leq$ 1
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