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Aratati ca numerele urmatoare sunt naturale:[tex] a)\frac{a+2b}{a+b} + \frac{b+2a}{a+b}
b) \frac{3a+2b}{a+b+c} + \frac{3b+2c}{a+b+c} + \frac{3c+2a}{a+b+c} [/tex]