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Arata ca
[tex]x = \sqrt{ \frac{121}{9} } + \sqrt{0.(4)} - \sqrt{0.(1)} [/tex]
este un nr rational​


Răspuns :

x=√(121/9)+√0,(4)-√0,(1)

x=11/3+√(4/9)-√(1/9)

x=11/3+2/3-1/3

x=13/3-1/3

x=12/3

x=4∈Q