8c / (c² - b²) + 8 / (b - c)
приводим к общему знаменателю
8c / (c² - b²) - 8 / (c - b) = 8c / (c² - b²) - 8(c + b) / (c - b)(c + b) = (8c - 8c - 8b)/(c² - b²) = - 8b/(c² - b²)
c = -3
b = -2
- 8b/(c² - b²) = -8*(-2) / ((-3)² - (-2)²) = 16/(9 - 4) = 16/5 = 3.2
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Verified answer
8c / (c² - b²) + 8 / (b - c)
приводим к общему знаменателю
8c / (c² - b²) - 8 / (c - b) = 8c / (c² - b²) - 8(c + b) / (c - b)(c + b) = (8c - 8c - 8b)/(c² - b²) = - 8b/(c² - b²)
c = -3
b = -2
- 8b/(c² - b²) = -8*(-2) / ((-3)² - (-2)²) = 16/(9 - 4) = 16/5 = 3.2