Question

найдите значение выражения

Answer 1

$\frac{ {9}^{ - 3} \times {9}^{ - 6} }{ {9}^{ - 11} } = \frac{ {9}^{ - 9} }{ {9}^{ - 11} } = {9}^{ - 9 - ( -11)} = \\ = {9}^{ - 9 + 11} = {9}^{2} = 81$