Question

(а^-2)^3×а^5×5/а^-7×а^4

Answer 1

$(a^{ - 2} )^{6} \times a^{5} \times \frac{ 5 }{ {a}^{ - 7} } \times {a}^{ -4} = {a}^{ - 12} \times {a}^{5} \times 5 \times {a}^{7} \times {a}^{4} = \frac{1}{ {a}^{12} } \times 5 \times {a}^{16} = 5 \times {a}^{4}$