\[\boxed{\text{496\ (496).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
Пояснение.
Решение.
\[1)\ (2a)^{2} = 4a^{2}.\]
\[2)\ \left( a^{2} \right)^{2} = a^{4}.\]
\[3)\ \left( 3b^{3} \right)^{2} = 9b^{6}.\]
\[4)\ \left( 7x^{4} \right)^{2} = 49x^{8}.\]
\[5)\ (0,3x)^{2} = 0,09x^{2}.\]
\[6)\ \left( 0,4y^{5}z^{2} \right)^{2} = 0,16y^{10}z^{4}.\]
\[7)\ \left( \frac{1}{6}a^{2}b^{3}c^{4} \right)^{2} = \frac{1}{36}a^{4}b^{6}c^{8}.\]
\[8)\ \left( 1\frac{1}{3}m^{6}n \right)^{2} = \left( \frac{4}{3}m^{6}n \right)^{2} =\]
\[= \frac{16}{9}m^{12}n^{2} = 1\frac{7}{9}m^{12}n^{2}\text{.\ }\]