Cho a,b,c là các số thực dương, CMR
   $$\frac{3a^{3}+7b^{3}}{2a+3b}+\frac{3b^{3}+7c^{3}}{2b+3c}+\frac{3c^{3}+7a^{3}}{2c+3a}\geq 3(a^{2}+b^{2}+c^{2})-ab-bc-ca$$

Cm $\frac{3a^{3}+7b^{3}}{2a+3b}\geq a^{2}+2b^{2}-ab$(biến đổi tươg đươg)

tương tự ...
uh, tks các bạncâu này cũng không khó lắm nhỉ –  kietvu40 22-05-14 09:30 PM
bạn nhân vào ,xong khai triển sẽ ra (a-b)^2 >= o (luôn luôn đúng),tương tự... –  greengreen4398 22-05-14 04:39 PM
tks nhétiện cho mk hỏi hướng suy luận đc không :P –  kietvu40 22-05-14 02:44 PM

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