Question

A={aIa 2x barat/3x barat,x≤5}
Enumerati elementele multimii.

Answer 1

$a= \frac{2x}{3x}$, a2x şi 3x fiind în baza zece, buuun
x = 0: a = $\frac{20}{30} = \frac{2}{3}$
x = 1: a = $\frac{21}{31}$
x = 2: a = $\frac{22}{32} = \frac{11}{16}$
x = 3: a = $\frac{23}{33}$
x = 4: a = $\frac{24}{34} = \frac{12}{17}$
x = 5: a = $\frac{25}{35} = \frac{5}{7}$

deci elementele mulţimii sunt: $\frac{2}{3} , \frac{21}{31} , \frac{11}{16} , \frac{23}{33} , \frac{12}{17} , \frac{5}{7}$