Răspuns
Explicație pas cu pas:
12 / 22 = ( 12 : 2 ) / ( 22 : 2 ) = 6 / 11 → fractie ireductibila
12 / 22 = 6 / 11 ⇒ 12 × 11 = 6 × 22 = 132 → fractii echivalente ( produsul mezilor = produsul extremilor )
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1212 / 2121 = ( 1212 : 3) / ( 2121 : 3 ) = 404 / 707 =
= ( 404 : 101 ) / ( 707 : 101 ) = 4 / 7→ fractie ireductibila
1212 / 2121 = 4 / 7 → fractii echivalente ⇒ 7 × 1212 = 4 × 2121 = 8484
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121212 / 212121 = ( 121212 : 30 303 ) / ( 212121 : 30 303 ) = 4 / 7
