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nguyenthuylinhgtb
2 năm trước
Cho a,b là các số dương. CM rằng: $\frac{2a^2 + 3b^2}{2a^3 + 3b^3}$ + $\frac{2b^2 + 3a^2}{2b^3 + 3a^3}$ $\leq$ $\frac{4}{a + b}$ ctlhn + 5 sao
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