-5с²(6-4с)(2с²+7с) = -5c²(12c² + 42c - 8c³ - 28c²) = -5c²(-16c² + 42c - 8c³) = 90c^4 - 210с³ + 40с^5.
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-5с²(6-4с)(2с²+7с) = -5c²(12c² + 42c - 8c³ - 28c²) = -5c²(-16c² + 42c - 8c³) = 90c^4 - 210с³ + 40с^5.