Question

Помогите 10 номер прошу 50 балов​

Answer 1

$\frac{(a^{5})^{6}*a^{7}:a^{29}}{a^{21}:a^{19}*a^{2}}=\frac{a^{30}*a^{7}:a^{29}}{a^{21}:a^{19}*a^{2}}=\frac{a^{30+7-29}}{a^{21-19+2}}=\frac{a^{8}}{a^{4}} =a^{8-4}=a^{4}\\\\a=-1\Rightarrow a^{4}=(-1)^{4}=\boxed1$