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100x= 23,232323...
100x - x= 23
99x= 23 /:99
x=23/99
Odp. 0.(23)= 23/99
2) 1, 1/2x 1/4x², 1/8x³,...
Szereg geometryczny jest zbieżny⇔ IqI<1
q= 1/2x : 1= 1/2x =x/2
Ix/2I<1
-1< x/2 <1 /·2
-2 <x<2
x∈ (-2, 2)