a>=b+c+d

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Claudiu Mindrila
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a>=b+c+d

Post by Claudiu Mindrila »

Fie \( a,\ b,\ c,\ d \) numere reale pozitive a.i. \( a\ge b+c+d \). Sa se arate ca \( \left(a+b\right)\left(b+c\right)\left(c+d\right)\left(d+a\right)\ge20abcd \).

Dan St. Marinescu
elev, clasa a X-a, C. N. "C-tin Carabella", Targoviste
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