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5р - 15 = 5 * (р - 3),

р³ - 27 = (р - 3)(р² + 3р + 9), значит:

общий знаменатель будет равен:

5(р - 3)(р² + 3р + 9) = 5(р³ - 27),

2р / (5р - 15) =

(2р * (р² + 3р + 9)) / 5(р³ - 27) =

= (2р³ + 6р² + 18р) / 5(р³ - 27),

1 / (р³ - 27) =

= 5 / 5(р³ - 27)

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