Разложите на множители многочлен: а)b-2b+b, б)ab+2ab+ab, в)3a+3b-ax-bx, г)5a-b+5a-ab, д)7a-7b+2b-2ab, е)b-b+4b+4

а) b - 2 * b + b = b - b - b + b = (b - b) - (b - b) = b * (b - 1) - b * (b - 1) =

= (b - b) * (b - 1);

б) a * b + 2 * a * b + a * b = a * b * (b + 2 * a * b + a) = a * b * (b + a);

в) 3 * a + 3 * b - a * x - b * x = 3 * (a + b) - х * (a + b) = (3 - х) * (a + b);

г) 5 * a - b + 5 * a - a * b = 5 * a * (1 + a) - b * (1 + a) = (5 * a - b) * (1 + a);

д) 7 * a - 7 * b + 2 * b - 2 * a * b = 7 * (a - b) - 2 * b * (a - b) = (7 - 2 * b) * (a - b);

е) b - b + 4 * b + 4 = b * (b - 1) + 4 * (b + 1) =

= b * (b - 1) * (b + 1)  + 4 * (b + 1) = (b + 1) * (b * (b - 1) + 4).