Question

даю 36 баллов номера по алгебре 343 и 345

Answer 1

1) 16ab² - 5b²c - 10c³ + 32ac² = (16ab² + 32ac²) - (5b²c + 10c³) = 16a(b² + 2c²) -
- 5c(b² + 2c²) = (b² + 2c²) (16a - 5c)
2) 6mnk² + 15m²k - 14n³k - 35mn² = (6mnk² + 15m²k) - (14n³k + 35mn²) =
= 3mk(2nk + 5m) - 7n²(2nk + 5m) = (2nk + 5m)(3mk - 7n²)
3) - 28ac + 35c² - 10cx + 8ax = (- 28ac + 35c² ) - (10cx - 8ax) = - 7c(4a - 5c) -
- 2x(5c - 4a) = 7c(5c - 4a) - 2x(5c - 4a) = (5c - 4a)(7c - 2x)
4) - 24bx - 15c² + 40bc + 9cx = (- 24bx + 9cx) - (15c² - 40bc) = - 3x(8b - 3c) -
- 5c(3c - 8b) = 3x(3c - 8b) - 5c(3c - 8b) = (3c - 8b)(3x - 5c)
1) 5a² - 5ax - 7a + 7x = (5a² - 5ax) - (7a - 7x) = 5a(a - x) - 7(a - x) =
= (a - x)(5a - 7)
(4 - (- 3))(5*4 - 7) = (4 + 3)(20 - 7) = 7 * 13 = 91
2) m² - mn - 3m + 3n = (m² - mn) - (3m - 3n) = m(m - n) - 3(m - n) =
= (m - n)(m - 3)
(0,5 - 0,25)(0,5 - 3) = 0,25 * (- 2,5) = - 0,625
3) a² + ab - 5a - 5b = (a² + ab) - (5a + 5b) = a(a + b) - 5(a + b) =
= (a + b)(a - 5)
(6,6 + 0,4)(6,6 - 5) = 7 * 1,6 = 11,2
4) a² - ab - 2a + 2b = (a² - ab) - (2a - 2b) = a(a - b) - 2(a - b) =
= (a - b)(a - 2)
$( frac{7}{20}-0,15)( frac{7}{20} -2)= (0,35-0,15)(0,35-2) = 0,2 * (-1,65) =$$-0,33$

Answer 2

большое спасибо надеюсь это правильно