Question

Помогите пожалуйста! Срочна!

Answer 1

$(a {}^{ 5} ) {}^{ - 2} times (a {}^{ - 15} ) {}^{ - 1} = a {}^{ 5 times (- 2)} times a {}^{ - 15 times ( - 1)} = a {}^{ - 10} times a {}^{15} = a {}^{5}$