вправа 476 гдз 7 клас алгебра Мерзляк Полонський

Відповідь:

1) ma + mb + 4a + 4b =
= m(a + b) + 4(a + b) =
= (m + 4)(a + b);
2)3x + cy + cx + 3y =
= 3x + 3y + cx + cy=
= 3(x + y) + c(x + y) =
= (3 + c)(x + y);
3)5a - 5b + ap - bp =
= 5(a - b) + p(a - b) =
= (5 + p)(a - b);
4)7m + mn + 7 + n =
= m(7 + n) + (7 + n) =
= (m + 1)(7 + n);
5)a - 1 + ab - b =
= (a - 1) + b(a - 1) =
= (1 + b)(a - 1);
6)xy + 8y - 2x - 16 =
= y(x + 8) - 2(x + 8) =
= (y - 2)(x + 8);
7)ab + ac - b - c =
= a(b + c) - (b + c) =
= (a - 1)(b + c);
8)3p - 3k - 4ap + 4ak =
= 3(p - k) - 4a(p - k) =
= (3 - 4a)(p - k).