Разложить на множители 2b-2c+ab--ac, ab-ac+5b-5c, xy-xz-y+z, km-k-2m+2,3x-3y-2ax+2ay

1. 2 * b - 2 * c + a * b - a * c = (2 * b - 2 * c) + (a * b - a * c) =

2 * (b - c) + a * (b - c) = (b - c) * (2 * a - c);

2. a * b - a * c + 5 * b - 5 * c = (a * b - a * c) + (5 * b - 5 * c) =

a * (b - c) + 5 * (b - c) = (b - c) * (a + 5);

3. x * y - x * z - y + z = (x * y - x * z) - (y - z) =

x * (y - z) - (y - z) = (y - z) * (x - 1);

4. k * m - k - 2 * m + 2 = (k * m - k) - (2 * m - 2) =

k * (m - 1) - 2 8 (m - 1) = (m - 1) * (k - 2);

5. 3 * x - 3 * y - 2 * a * x + 2 * a * y = (3 * x - 3 * y) - (2 * a * x - 2 * a * y) =

3 * (x - y) - 2 * a * (x - y) = (x - y) * (3 - 2 * a).