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thotrangdangyeu_baby95
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
cho a,b,c>0 CMR:
a) (b^3+c^3)/a+(c^3+a^3)/b+(a^3+b^3)/c\geq2(ab+bc+ca)
b) 1/a+1/b+1/c\geq3/(a+2b)+3/(b+2c)+3/(c+2a)
a) (b^3+c^3)/a+(c^3+a^3)/b+(a^3+b^3)/c\geq2(ab+bc+ca)
b) 1/a+1/b+1/c\geq3/(a+2b)+3/(b+2c)+3/(c+2a)