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Daca:  2(a + √2) = b√2, a, b∈Q => a =........, b=......... .



Răspuns :

2a+2rad2=brad2
2a=brad2-2rad2
2a =(b-2)rad2
rad2=2a/(b-2) nr rational, deci b-2=0
b=2
2a=0
a=0