共50条信息
计算:\(2\cos 30{}^\circ +{{\left( \pi -\cos 45{}^\circ \right)}^{0}}-3\tan 30{}^\circ +{{(-\dfrac{1}{2})}^{-2}}\)
\((1)\)计算:\(|2−\tan {60}^{∘}|−(π−3.14{)}^{0}+(− \dfrac{1}{2}{)}^{−2}+ \dfrac{1}{2} \sqrt{12} \).
计算:\((-2018)^{0} -\sqrt{\mathbf{8}}+3\tan 30^{\circ}+|1-\sqrt{2}|\)
\((\sqrt{7}-1)^{0}-(-\dfrac{1}{2})^{-2}+\sqrt{3}\tan 30^{\circ}\);
\((1)\)计算:\({\left(- \dfrac{1}{3}\right)}^{-1}+{\left(2015- \sqrt{3}\right)}^{0}-4\sin 60^{\circ}+\left|- \sqrt{12}\right| \)
\((2)\)先化简,再求值:\(\left( \dfrac{1}{a+b}- \dfrac{1}{a-b}\right)÷ \dfrac{b}{{a}^{2}-2ab+{b}^{2}} \)
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