共50条信息
化简
\((1)2x+(5x-3y)-(3x+y)\)
\((2)3(4x^{2}-3x+2)-2(1-4x^{2}-x)\)
先化简，再求值：\(2x^{2}+3({-}x^{2}+3xy-y^{2}){-}({-}x^{2}{-}2y^{2})\)，其中\(x= \dfrac{1}{2} \)，\(y=-2\)．
\((１)7x-\)\( \dfrac{1}{2}\left[x- \dfrac{1}{2}\left(x-1\right)\right]= \dfrac{2}{3}\left(x-1\right) \)
\((2)\) \(\dfrac{x-3}{0.5}-\dfrac{x+4}{0.2}=1.6\)
\((3)\dfrac{1}{2}\{\dfrac{1}{3}[\dfrac{1}{4}(\dfrac{1}{5}x-1)-6]+4\}=1\)
计算：
\((1) \sqrt{25}- \sqrt[3]{-27}+ \sqrt{ \dfrac{1}{4}}\)
\((2)\sqrt{{{\left( -2 \right)}^{2}}}+\left| \sqrt{2}-1 \right|-\left( \sqrt{2}+1 \right)\)
进入组卷