Ответы на вопрос:
⁵/₇(2,8c-4¹/₅d)-2,4(⁵/₆ c-1,5d) = 0,6d1) ⁵/₇(2,8c-4¹/₅d) = ⁵/₇ײ⁸/₁₀c - ⁵/₇ײ¹/₅d =⁵ˣ²⁸/₇ₓ₁₀c - ²¹ˣ⁵/₅ₓ₇d = ⁴/₂с - 3d = 2c - 3d 2) 2,4(⁵/₆c-1,5d) =2,4×⁵/₆c - 2,4×1,5d =²⁴/₁₀×⁵/₆c - 3,6d =²⁴ˣ⁵/₁₀ₓ₆c-3,6d = ⁴/₂c-3,6d = 2c-3,6d 3) (2c - 3d) - (2c-3,6d) = 2c - 3d - 2c + 3,6d = 0,6d
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