Zamień na ułamek zwykły 4,(31)
4, (31) = 4,3131...
x = 4,3131... /* 100
100x = 431,31...
100x - x = 431,31 ... - 4,3131...
99x = 427 /:99
x = 427/99
x = 4 31/99
x = 4,(31)
x = 4,3131
100x = 431,3131
--------------------
100x-x = 431,3131-4,3131
x = 4 i 31/99
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4, (31) = 4,3131...
x = 4,3131... /* 100
100x = 431,31...
100x - x = 431,31 ... - 4,3131...
99x = 427 /:99
x = 427/99
x = 4 31/99
x = 4,(31)
x = 4,3131
100x = 431,3131
--------------------
100x-x = 431,3131-4,3131
99x = 427 /:99
x = 427/99
x = 4 i 31/99