\[\boxed{\text{792\ (792).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
Пояснение.
Решение.
\[\textbf{а)}\ ma - mb + na - nb + pa - pb =\]
\[= m(a - b) + n(a - b) + p(a - b) =\]
\[= (a - b)(m + n + p)\]
\[\textbf{б)}\ ax - bx - cx + ay - by - cy =\]
\[= x(a - b - c) + y(a - b - c) =\]
\[= (a - b - c)(x + y)\]
\[\textbf{в)}\ x^{2}\ + ax^{2} - y - ay + cx^{2} - cy =\]
\[= x^{2}(1 + a + c) - y(1 + a + c) =\]
\[= (1 + a + c)(x^{2} - y)\]
\[\textbf{г)}\ ax^{2} + 2y - bx^{2} + ay + 2x^{2} - by =\]
\[= x^{2}(a - b + 2) + y(a - b + 2) =\]
\[= (a - b + 2)(x^{2} + y)\ \]