优优班--学霸训练营 > 知识点挑题
全部资源
          排序:
          最新 浏览

          50条信息

            • 1.

              定义运算\(\left| \begin{matrix} {{a}_{1}} & {{a}_{2}} \\ {{a}_{3}} & {{a}_{4}} \\\end{matrix} \right|={{a}_{1}}{{a}_{4}}-{{a}_{2}}{{a}_{3}}\),将函数\(f(x)=\left| \begin{matrix} \sqrt{3} & \sin x \\ 1 & \cos x \\\end{matrix} \right|\)的图像向左平移\(n(n > 0)\)个单位,所得图像对应的函数为偶函数,则\(n\)的最小值是\((\)    \()\)

              A.\(\dfrac{\pi }{6}\)
              B.\(\dfrac{\pi }{3}\)
              C.\(\dfrac{2\pi }{3}\)
              D.\(\dfrac{5\pi }{6}\)
            • 2. 定义运算\( \begin{vmatrix} a & b \\ c & d\end{vmatrix} =ad-bc\),则符合条件\( \begin{vmatrix} 1 & -1 \\ z & zi\end{vmatrix} =4+2i\)的复数\(z\)为\((\)  \()\)
              A.\(3-i\)
              B.\(1+3i\)
              C.\(3+i\)
              D.\(1-3i\)
            • 3.

              定义行列式运算\(\left| \begin{matrix} {{a}_{1}} & {{a}_{2}} \\ {{a}_{3}} & {{a}_{4}} \\\end{matrix} \right|={{a}_{1}}{{a}_{4}}{-}{{a}_{2}}{{a}_{3}}.\)将函数  \(f(x)=\left| \begin{matrix} \sqrt{3} & \sin x \\ 1 & \cos x \\\end{matrix} \right|\)的图象向左平移 \(n(n > 0\) \({\,\!})\)个单位,所得图象对应的函数为偶函数,则\(n\) \({\,\!}\)的最小值为   \((\)   \()\)

              A.\(\dfrac{\pi }{6}\)
              B.\({\,\!}\)  \(\dfrac{\pi }{3}\)
              C.\(\dfrac{5\pi }{6}\) \({\,\!}_{\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;}\)
              D. \(\dfrac{2\pi }{3}\)
            • 4.

              定义行列式运算\(\left| \begin{matrix} {{x}_{1}}\,\,\,\,\,{{y}_{1}} \\ {{x}_{2}}\,\,\,\,\,{{y}_{2}} \\\end{matrix} \right|={{x}_{1}}{{y}_{2}}-{{x}_{2}}{{y}_{1}},\)将函数\(f\left( x \right)=\left| \begin{matrix} \sqrt{3}\,\,\,\,\cos x \\ 1\,\,\,\,\,\,\,\,\sin x \\\end{matrix} \right|\)的图象向右平移\(\varphi (\varphi > 0)\)个单位,所得图象对应的函数为奇函数,则\(\varphi \)的最小值为\((\)   \()\)

              A.\(\dfrac{\pi }{6}\)
              B.\(\dfrac{\pi }{3}\)
              C.\(\dfrac{2\pi }{3}\)
              D.\(\dfrac{5\pi }{6}\)
            • 5.
              行列式\( \begin{vmatrix} 1 & 4 & 7 \\ 2 & 5 & 8 \\ 3 & 6 & 9\end{vmatrix} \)中,元素\(7\)的代数余子式的值为\((\)  \()\)
              A.\(-15\)
              B.\(-3\)
              C.\(3\)
              D.\(12\)
            • 6.

              行列式\(\begin{vmatrix}1 & 4 & 7 \\ 2 & 5 & 8 \\ 3 & 6 & 9\end{vmatrix}\begin{matrix} \\ \\ \end{matrix} \)中,元素\(7\)的代数余子式的值为\((\)   \()\)

              A.\(-15\)           
              B.\(-3\)           
              C.\(3\)           
              D.\(12\)
            • 7.

              定义运算:\(\left| \begin{matrix} {{a}_{1}} & {{a}_{2}} \\ {{a}_{3}} & {{a}_{4}} \\ \end{matrix} \right|={{a}_{1}}{{a}_{4}}-{{a}_{2}}{{a}_{3}}\),将函数\(f(x)=\left| \begin{matrix} \sqrt{3} & \sin \omega x \\ 1 & \cos \omega x \\ \end{matrix} \right|(ω > 0)\)的图象向左平移\(\dfrac{2\pi }{3}\)个单位,所得图象对应的函数为偶函数,则\(ω\)的最小值是

              A.\(\dfrac{1}{4}\)
              B.\(\dfrac{5}{4}\)
              C.\(\dfrac{7}{4}\)
              D.\(\dfrac{3}{4}\)
            • 8.
              定义运算\( \begin{vmatrix} a & b \\ c & d\end{vmatrix} =ad-bc\),则符合条件\( \begin{vmatrix} 1 & -1 \\ z & zi\end{vmatrix} =4+2i\)的复数\(z\)为\((\)  \()\)
              A.\(3-i\)
              B.\(1+3i\)
              C.\(3+i\)
              D.\(1-3i\)
            • 9.

              定义运算\(\begin{vmatrix}a & b \\ c & d\end{vmatrix}=ad-bc \),则符合条件\(\begin{vmatrix}1 & -1 \\ z & zi\end{vmatrix}=4+2i \)的复数\(z \)为\((\)    \()\)

              A.\(1+3i \)
              B.\(1-3i \)
              C.\(3-i \)
              D.\(3+i \)
            • 10.

              若矩阵\(\begin{pmatrix}{a}_{11} & {a}_{12} \\ {a}_{21} & {a}_{22}\end{pmatrix} \)满足:\({a}_{11},{a}_{12},{a}_{21},{a}_{22}∈\left\{0,1\right\} \),且\(\begin{vmatrix}{a}_{11} & {a}_{12} \\ {a}_{21} & {a}_{22}\end{vmatrix}=0 \),则这样的互不相等的矩阵共有

              A.   \(2\)个         
              B.  \(6\)个           
              C.  \(8\)个            
              D.  \(10\)个
            0/40

            进入组卷