Ответ:
8³/⁷-(4⁵/⁷-b) = 8³/⁷-4⁵/⁷+2²/⁷ = 8⁵/⁷-4⁵/⁷ = 4.
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Ответ:
8³/⁷-(4⁵/⁷-b) = 8³/⁷-4⁵/⁷+2²/⁷ = 8⁵/⁷-4⁵/⁷ = 4.