в) (5x³ + 3x² - 7) + (4 + 3x² - 5x³) = 5x³ + 3x² - 7 + 4 + 3x² - 5x³ =
= 6x² - 3
г) (10a - 2b + 5c) - (- 5a + 20b - c) = 10a - 2b + 5c + 5a - 20b + c) =
= 15a - 22b + 6c
д) (14mn - 15m) + (- 15mn - 7m) = 14mn - 15m - 15mn - 7m = - mn - 22m
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в) (5x³ + 3x² - 7) + (4 + 3x² - 5x³) = 5x³ + 3x² - 7 + 4 + 3x² - 5x³ =
= 6x² - 3
г) (10a - 2b + 5c) - (- 5a + 20b - c) = 10a - 2b + 5c + 5a - 20b + c) =
= 15a - 22b + 6c
д) (14mn - 15m) + (- 15mn - 7m) = 14mn - 15m - 15mn - 7m = - mn - 22m