Răspuns :
a=[0,5×0,(6)+1/6]:2⁻²
a=(5/10×6/9+1/6):1/2²
a=(1/2×2/3+1/6):1/4
a=(1/3+1/6):1/4
a=(2/6+1/6):1/4
a=3/6:1/4
a=1/2:1/4
a=1/2×4
a=2∈N
a=[0,5×0,(6)+1/6]:2⁻²
a=(5/10×6/9+1/6):1/2²
a=(1/2×2/3+1/6):1/4
a=(1/3+1/6):1/4
a=(2/6+1/6):1/4
a=3/6:1/4
a=1/2:1/4
a=1/2×4
a=2∈N