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0,(5) = 5/9
4/9 + 5/9 = 9/9 = 1
4/9+5/9=9/9=1
0,(9) jednak dąży do 1 i równa się jedynce gdyż
0,(9) = x /*10
9,(9) = 10x /-x
9 = 9x
x = 1