Question

СРОЧНО!!! Даю 70 баллов. Помогите пожалуйста а-то убьют. ​

Answer 1

Ответ:

1.

1) 6a⁴ - 15a³ + 6a

2)x³ - 2x² - 11x + 12

2.

1) 6b(2a - 3b)

2) 7x⁴(3x³ - 1)

3) (8 + a)(x - y)

3.

x₁ = 3

x₂ = 0

4.

5m² - 4m + 6

5.

x = 8,8

Пошаговое объяснение:

1.

1) 3a(2a³ - 5a² + 2) = 6a⁴ - 15a³ + 6a

2) (x - 4)(x² + 2x - 3) = x³ + 2x - 3x - 4x² - 8x + 12 = x³ - 2x² - 11x + 12

2.

1) 12ab - 18b² = 6b(2a - 3b)

2) 21x⁷ - 7x⁴ = 7x⁴(3x³ - 1)

3) 8x - 8y + ax - ay = 8(x - y) + a(x - y) = (8 + a)(x - y)

3.

5x² - 15x = 0

$\\ D = b^2 - 4ac$

D = (-15)² - 4 * 5 * 0

D = 225

x₁,₂ = (-b ± √D)/2a

===============

x₁ = (15 + √225)/2 * 5

x₁ = 30/10

x₁ = 3

===============

x₁ = (15 - √225)/2 * 5

x₁ = 0/10

x₂ = 0

4.

3m(2m - 1) - (m + 3)(m - 2) = 6m² - 3m - m² + 2m - 3m + 6 = 5m² - 4m + 6

5.

(4x - 1)/9 - (x + 2)/6 = 2

(8x - 2)/18 - (3x + 6)/18 = 2

(8x - 2 - 3x - 6)/18 = 2

5x - 8 = 36

5x = 44

x = 8,8