Alegeti A SAU F in functie de valoarea de adevar a propozitiilor
a)daca o fractie ordinara ireductibila a supra b are numitor de forma b=2 x(sus)*5y(sus)cu,x,y e IN ,atunci fractia se transforma in fractie periodica mixta A-F
b)dintre numerele x=0,(3)*90si y=0,(2)*180,y este mai mare A-F
c)fractie 1 supra 7 are cifra 6 in perioada A-F
d)intre numerele 0,(4)*3 si 1,(21)*11 exista 13 numere naturale A-F
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