Решим данные выражения:
10) $$(a^2)^5 \cdot a^5 = a^{2\cdot5} \cdot a^5 = a^{10} \cdot a^5 = a^{10+5} = a^{15}$$
11) $$(a^2 \cdot a^5)^2 = (a^{2+5})^2 = (a^7)^2 = a^{7\cdot2} = a^{14}$$
12) $$a^4 \cdot (a^4)^4 = a^4 \cdot a^{4\cdot4} = a^4 \cdot a^{16} = a^{4+16} = a^{20}$$
13) $$(a \cdot a^7)^2 = (a^{1+7})^2 = (a^8)^2 = a^{8\cdot2} = a^{16}$$
10) $$y^{12} \cdot (y^4)^2 = y^{12} \cdot y^{4\cdot2} = y^{12} \cdot y^8 = y^{12+8} = y^{20}$$
11) $$(y^5)^2 \cdot (y^2)^2 = y^{5\cdot2} \cdot y^{2\cdot2} = y^{10} \cdot y^4 = y^{10+4} = y^{14}$$
12) $$(y^3)^3 \cdot (y^3)^2 = y^{3\cdot3} \cdot y^{3\cdot2} = y^9 \cdot y^6 = y^{9+6} = y^{15}$$