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thaicuc95


Chứng mình rằng
a) [TEX]a^4 + b^4 +c^4 >= abc(a+b+c)[/TEX]
b)[TEX] (a-6)(a-4)(a-3)(a-1) + 10 >=0[/TEX]
c) [TEX]a^4 + b^4 <= \frac{a^6}{b^2} + \frac{b^6}{a^2}[/TEX]
a) [TEX]a^4 + b^4 +c^4 >= abc(a+b+c)[/TEX]
b)[TEX] (a-6)(a-4)(a-3)(a-1) + 10 >=0[/TEX]
c) [TEX]a^4 + b^4 <= \frac{a^6}{b^2} + \frac{b^6}{a^2}[/TEX]