Question

8)(-3)-3степени-3,5-1степени;​

Answer 1

${( - 3)}^{ - 3} - {(3.5)}^{ - 1} = \frac{1}{ {( - 3)}^{3} } - \frac{1}{ {(3.5)}^{1} } = - \frac{1}{27} - \frac{1}{3.5} = - \frac{1}{27} - \frac{1}{ \frac{35}{10} } = - \frac{1}{27} - \frac{10}{35} = - \frac{1}{27} - \frac{2}{7} = - \frac{1 \times 7}{27 \times 7} - \frac{2 \times 27}{7 \times 27} = - \frac{7}{189} - \frac{54}{189} = - ( \frac{7 + 54}{189} ) = - \frac{61}{189}$