Question

как решить??...........

Answer 1

${5}^{ - 7} \times {5}^{5 \times 2} = {5}^{ - 7 + 10} = {5}^{3} = 125$
$\frac{ {2}^{ - 4 \times 6} }{ {2}^{ - 20} } = \frac{ {2}^{ - 24} }{ {2}^{ - 20} } = {2}^{ - 24 + 20} = {2}^{ -4} = \frac{1}{ {2}^{4} } = \frac{1}{16}$