zamień na ułamek zwykły liczbę 1,3(15)
x=1,31515...
10x=13,1515...
1000x=1315,1515...
1000x-10x=1315,1515...-13,1515...
990x=1302
x=1302/990
x=217/165
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x=1,31515...
10x=13,1515...
1000x=1315,1515...
1000x-10x=1315,1515...-13,1515...
990x=1302
x=1302/990
x=217/165