a) \(\left(-\dfrac{2}{5}\right)^2=\dfrac{\left(-2\right)^2}{5^2}=\dfrac{4}{25}\)
\(\left(-\dfrac{1}{2}\right)^5=\dfrac{\left(-1\right)^5}{2^5}=-\dfrac{1}{32}\)
b) \(\left(0,125\right)^{21}\cdot8^{21}\)
\(=\left(0,125\cdot8\right)^{21}\)
\(=1^{21}\)
\(=1\)
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