а) (a + b)(a - b) - (a - c)(a + c) + (b - c)(b + c) = a² - b² - (a² - c²) + b² - c² = a² - a² - b² + b² + c² - c² = 0
б) (a - b)(a² + ab + b²) + (b + c)(b² - bc + c²) - (a + c)(a² - ac + c²) = a³ - b³ + b³ + c³ - (a³ + c³) = a³ - a³ - b³ + b³ + c³ - c³ = 0
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а) (a + b)(a - b) - (a - c)(a + c) + (b - c)(b + c) = a² - b² - (a² - c²) + b² - c² = a² - a² - b² + b² + c² - c² = 0
б) (a - b)(a² + ab + b²) + (b + c)(b² - bc + c²) - (a + c)(a² - ac + c²) = a³ - b³ + b³ + c³ - (a³ + c³) = a³ - a³ - b³ + b³ + c³ - c³ = 0
b)=a³-b³+b³+c³-a³-c³=0