Yпростите выражения:a) c (3c²-5c-1) - 4c (3c²-5c-2) + 3c (3c²-5c+1) b) 2m (3-m+5m²) + 3m (1-m+5m²) - 5m (5m²-m) c) 3a (a²+3a+2) - 4a (a²+3a-2) + 2a (a²+3a-1)

a). c (3 c² - 5 c - 1) - 4 c (3 c² - 5 c - 2) + 3 c (3 c² - 5 c + 1) =

= 3 c³ - 5 c² - c - 12 c³ + 20 c² + 8 c + 9 c³ - 15 c² + 3 c =

= (3 c³ - 12 c³ + 9 c³) + (20 c² - 5 c² - 15 c²) + (8 c + 3 c - c) = 10 c;

b). 2 m (3 - m + 5 m²) + 3 m (1 - m + 5 m²) - 5 m (5 m² - m) =

= 6 m - 2 m² + 10 m³ + 3 m - 3 m² + 15 m³ - 25 m³ + 5 m² =

= (10 m³ + 15 m³ - 25 m³) + (5 m² - 2 m² - 3 m²) + (6 m + 3 m) = 9 m;

c). 3 a (a² + 3 a + 2) - 4 a (a² + 3 a - 2) + 2 a (a² + 3 a - 1) =

= 3 a³ + 9 a² + 6 a - 4 a³ - 12 a² + 8 a + 2 a³ + 6 a² - 2 a =

= (3 a³ - 4 a³ + 2 a³) + (9 a² - 12 a² + 6 a²) + (6 a + 8 a) = a³ + 3 a² + 14 a.