Tính
\((-\dfrac{1}{2})^2 = \dfrac{1}{4}\); \((-\dfrac{1}{2})^3 = -\dfrac{1}{8}\);
\((-\dfrac{1}{2})^4 = \dfrac{1}{16}\); \((-\dfrac{1}{2})^5 = -\dfrac{1}{32}\)
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