\(25\%-1\dfrac{1}{2}=\dfrac{1}{4}-\dfrac{3}{2}=\dfrac{1}{4}-\dfrac{6}{4}=-\dfrac{5}{5}\)\(-\left(-\dfrac{1}{2}\right)^2+0,25:\dfrac{1}{12}=-\dfrac{1}{4}+\dfrac{1}{4}:\dfrac{1}{12}=0:\dfrac{1}{12}=0\)Câu trả lời: \(25\%-1\dfrac{1}{2}=\dfrac{1}{4}-\dfrac{3}{2}=\dfrac{1}{4}-\dfrac{6}{4}=-\dfrac{5}{5}\)\(-\left(-\dfrac{1}{2}\right)^2+0,25:\dfrac{1}{12}=-\dfrac{1}{4}+\dfrac{1}{4}:\dfrac{1}{12}=0:\dfrac{1}{12}=0\)