\[\boxed{\text{1190\ (1190).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1)\frac{1}{64}a^{8} - b^{6} = \left( \frac{1}{8} \right)^{2}a^{8} - b^{6} =\]
\[= \left( \frac{1}{8}a^{4} - b^{3} \right)\left( \frac{1}{8}a^{4} + b^{3} \right)\]
\[2)\ a^{3}b^{6}c^{9} + 8 = \left( ab^{2}c^{3} \right)^{3} + 2^{3} =\]
\[= \left( ab^{2}c^{3} + 2 \right)\left( a^{2}b^{4}c^{6} - 2ab^{2}c^{3} + 4 \right)\]
\[3)\ x^{21}y^{24} - m^{12}n^{15} =\]
\[4)\ a^{6}b^{6} + 1 =\]
\[= \left( a^{2}b^{2} + 1 \right)\left( a^{4}b^{4} - a^{2}b^{2} + 1 \right)\text{\ \ }\]