Tính: a) \( \frac{2}{5} \cdot 5^{2} - \frac{1}{2} = \frac{3}{4} \) b) \( \left( \frac{2}{3} \right)^{3} - \left( \frac{3}{4} \right)^{2} \)

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Bài 1: Tính:
a) \( \frac{2}{5} \cdot 5^{2} - \frac{1}{2} = \frac{3}{4} \)

b) \( \left( \frac{2}{3} \right)^{3} - \left( \frac{3}{4} \right)^{2} \)

c) \( 4 \cdot 1 \cdot \left( -\frac{1}{2} \right)^{3} + \frac{1}{2} \)

d) \( \left( 2 - \frac{3}{4} \right)^{2} : \frac{11}{6} \)