共50条信息
计算：
\((1)-3^{3}+(2017+3)^{0}-{{\left( {-}\dfrac{1}{3} \right)}^{{-}2}}\) \((2)70^{2}-69×71\)
\((3)(y+3x)(3x-y)-x(y+9x)\) \((4)(x-y+4)(x-y-4)\)
\(①\)计算\(\left| 2-\sqrt{3} \right|+\sqrt{6}\div \sqrt{2}-{{\left( -\dfrac{1}{2} \right)}^{{-}1}}\)
\(②\)先化简，再求值：\(\left( \dfrac{{{y}^{2}}}{y-x}-x-y \right)\div {{x}^{2}}\)，其中\(x-y =\tan 60{}^\circ \)．
\((1) \sqrt[3]{- \dfrac{27}{8}}+ \sqrt{ \dfrac{25}{4}} \)
\((2)2\left( \sqrt{3}-1\right)-\left| \sqrt{3}-2\right|+ \sqrt[3]{-64} \)
进入组卷