zamień na ułamek zwykły 0,7(68)
x = 0,7(68)
1000x=768,(68)
1000x=768,6868...
10x=7,6868...
990x= 768,6868... - 7,6868...
990x=761
x=761/990
0,7(68) = 7,(68) : 10
x = 7,(68) / * 100
100x = 768,(68) / - x
100x - x =768,6868... - 7,68686....
99x = 761
x = 761/99
0,7(68) = 7,(68) : 10= 761/99 : 10 = 761/99 * 1/10 = 761/990
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x = 0,7(68)
1000x=768,(68)
1000x=768,6868...
10x=7,6868...
990x= 768,6868... - 7,6868...
990x=761
x=761/990
0,7(68) = 7,(68) : 10
x = 7,(68) / * 100
100x = 768,(68) / - x
100x - x =768,6868... - 7,68686....
99x = 761
x = 761/99
0,7(68) = 7,(68) : 10= 761/99 : 10 = 761/99 * 1/10 = 761/990