a / b = aa / bb = aaa / bbb = aaaa / bbbb → fractii ecivalente,
unde a si b ∈ N*
→ aa / bb = ( a / b ) × 11 / 11 = a / b × 1 = a / b
→aaa / bbb = ( a / b ) × 111 / 111 = a / b
→ aaaa / bbbb = ( a / b ) × 1 111 / 1 111 = a / b
exemplu: 2 / 3 = 22 / 33 = 222 / 333
