\[\boxed{\text{264\ (264).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
Пояснение.
Решение.
\[1)\ 1,4x^{3}y^{7}\ \]
\[1,4 \cdot 4 = 5,6:\]
\[5,6x^{3}y^{7}.\]
\[2)\ c^{4}d^{10}p^{2}\ \]
\[1 \cdot 4 = 4:\]
\[4c^{4}d^{10}p^{2}.\]
\[3)\ 1\frac{1}{4}a^{5}b^{5}c^{9}\ \]
\[1\frac{1}{4} \cdot 4 = \frac{5}{4} \cdot 4 = 5:\]
\[5a^{5}b^{5}c^{9}.\]