додаваня дробив з однаковими знаменниками. 9 11/31 - 7 13/31 + 4 22/31 =
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9 11/31 - 7 13/31 + 4 22/31 =8 42\31-7 13\31+4 22\31=1 29\31+4 22\31=5 51\31==6 20\31