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1. \( (5)^2 \cdot (2)^2 = \) [ ].
2. \( 1 : \left(\dfrac{1}{3}\right)^3 = \) [ ].
3. \( \left(\dfrac{3}{4}\right)^2 \cdot 4^3 = \) [ ].
4. \( \left(1\dfrac{2}{5}\right) ^2 = \) [ ].