Question

ПОЖАЛУЙСТА!!!!! СРОЧНО !!!!!! 55 БАЛЛОВ

Answer 1

Вариант 1:

1. 1)

$3 {a}^{4} - 5 {a}^{3} = {a}^{3} (3a - 5)$

2)

$2a - 4ab + 6 {a}^{2} = 2a(1 - 2b + 3a)$

3)

$3(a + b) - (a + b) = (a + b)(3 - a)$

4)

$(x - y)a - (y - x)b = (x - y)a + (x - y)b = (x - y)(a + b)$

2.

$1.8(72 - 37 + 65) = 1.8 \times 100 = 180$

Вариант 2:

1. 1)

$4 {b}^{5} - 7 {b}^{4} = {b}^{4} (4b - 7)$

2)

$3b + 6ab - 9 {b}^{2} = 3b(1 + 2a - 3b)$

3)

$4(x + y) + (x + y) = (x + y)(4 + 1) = 5(x + y)$4)

$x(a - b) - y(b - a) = x(a - b) + y(a - b) = (a - b)(x + y)$

2.

$1.2(47 + 85 - 32) = 1.2 \times 100 = 120$