Liczba odwrotna do liczby a = 2⅔ ₋ 2,1 · ⁸/₂₁ =
a = 2⅔ ₋ 2,1 · ⁸/₂₁ =8/3-21/10*8/21=8/3-8/10=8/3-4/5=40/15-12/15=28/15
liczba odwrotna do liczby 28/15 to 15/28
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a = 2⅔ ₋ 2,1 · ⁸/₂₁ =8/3-21/10*8/21=8/3-8/10=8/3-4/5=40/15-12/15=28/15
liczba odwrotna do liczby 28/15 to 15/28