Дам 20 балов! Только помогите! Нужно разложить на множители.

1) 8a - 12b = 4(2a - 3b)

2) 3a - ab = a(3 - b)

3) 6ax + 6ay = 6a(x + y)

4) 4a + 8ac = 4a(a + 2c)

5) a + a = a(a + 1) = a(a + 1)(a - a + 1)

1) a(m + n) - b(m + n) = (m + n)(a - b)

2) x(2a - 5b) + y(2a - 5b) = (2a - 5b)(x + y)

3) 2m(a - b) + 3n(b - a) = 2m(a - b) - 3n(a - b) = (a - b)(2m - 3n)

4) 5x(b - c) - (c - b) = 5x(b - c) + (b - c) = (5x + 1)(b - c)

5) (a - 4) - 5(a - 4) = (a - 4)(a - 4 - 5) = (a - 4)(a - 9)

1) ab + ac + xb + xc = a(b + c) + x(b + c) = (b + c)(a + x)

2) 5a + 5b - am - bm = 5(a + b) - m(a + b) = (a + b)(5 - m)

3) 6m - mn - 6 + n = m(6 - n) - (6 - n) = (6 - n)(m - 1)

1) x - 4 = (x - 2)(x + 2)

2) 25 - 9a = (5 - 3a)(5 + 3a)

3) 36m - 100n = 4(9m - 25n) = 4*(3m - 5n)(3m + 5n)

4) 0,04p - 1,69q = (0,2p - 1,3q)(0,2p + 1,3q)

5) xy - 4/9 = (xy - 2/3)(xy + 2/3)