Помогите решить карточку с 1 по 4 задание

1

а) (b - 6) (b - 2) = b - 6b - 2b + 12 = b - 8b + 12

б)  (4y - 3) (3y - 2) = 12y - 9y - 8y + 6 = 12y - 17y + 6

в) (4a + 3b) (3a + 2b) = 12a + 9ab + 8ab + 6b = 12a + 17ab + 6b

г) (a - 3) (a + 3a - 4) = a - 3a + 3a - 9a - 4a + 12 = a - 13a + 12

2

а) a(a - b) - c(a - b) = (a - b) (a - c)

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

3

0.3x(2x - 1) (3x + 2) = 0.3x(6x^4 - 3x + 4x - 2) = 0.3x(6x^4 + x - 2) = 1.8x^5 + 0.3x - 0.6x

4

а) 3x - xy - 3y + y = 3(x - y) - y(x - y) = (x - y) (3 - y)

б) cx + cy - x - y - dx - dy = c(x + y) - (x + y) - d(x + y)= (x + y) (c - 1 - d)