chứng minh BDT

N

noinhobinhyen

Ta có

$(1-a)(1-b)(1-c) \leq (\dfrac{3-a-b-c}{3})^3 = \dfrac{8}{27}$

Lại có $(1-a)(1-b)(1-c)=1-a-b-c+ab+bc+ca-abc=ab+bc+ca-abc$
 
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