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Demonstrati inegalitatile:
a) (a+b)/(1+a+b)<a/(1+a)+b/(1+b),∀a,b∈(0;+infinit)

b)(a+b)/c+(b+c)/a+(c+a)/b≥6,∀a,b,c∈(0;+infinit)
c)1/(a+b)+1/(b+c)+1/(c+a)≤1/2(1/a+1/b+1/c),∀a,b,c∈(0;+infinit)


Răspuns :

Demonstratiile se gasesc in atasament.
Vezi imaginea АНОНИМ