Объяснение:

a)

[tex]( - \frac{3}{5})^{3} = - \frac{27}{125} [/tex]

б)

[tex] {2.3}^{2} - 27 \times ( \frac{1}{3} ) ^{2} = 5.29 - 27 \times \frac{1}{9} = 5.29 - 3 = 2.29 [/tex]