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.
              将正弦曲线\(y=\sin x\)经过伸缩变换\( \begin{cases} x′= \dfrac {1}{2}x \\ y′=3y\end{cases}\)后得到曲线的方程的周期为\((\)  \()\)
              A.\( \dfrac {π}{2}\)
              B.\(π\)
              C.\(2π\)
              D.\(3π\)
            • 2.
              将直线\(x+y=1\)变换为直线\(2x+3y=6\)的一个伸缩变换为\((\)  \()\)
              A.\(\begin{cases}x{{{"}}}=3x \\ y{{{"}}}=2y\end{cases} \)
              B.\(\begin{cases}x{{{"}}}=2x \\ y{{{"}}}=3y\end{cases} \)
              C.\( \begin{cases} x′= \dfrac {1}{3}x \\ y′= \dfrac {1}{2}y\end{cases}\)
              D.\( \begin{cases} x′= \dfrac {1}{2}x \\ y′= \dfrac {1}{3}y\end{cases}\)
            • 3.

              将直线\(x{+}y{=}1\)变换为直线\(2x{+}3y{=}6\)的一个伸缩变换为\(({  })\)

              A.\(\begin{cases}{x}^{{{{"}}}}=3x \\ {y}^{{{{"}}}}=2y\end{cases} \)
              B.\(\begin{cases}{x}^{{{{"}}}}=2x \\ {y}^{{{{"}}}}=3y\end{cases} \)
              C.\(\begin{cases} x{{{{"}}}=}\dfrac{1}{3}x \\ y{{{{"}}}=}\dfrac{1}{2}y \end{cases}\)
              D.\(\begin{cases} x{{{{"}}}=}\dfrac{1}{2}x \\ y{{{{"}}}=}\dfrac{1}{3}y \end{cases}\)
            • 4. 将曲线\(y=\sin \) \(2x\)按照伸缩变换\( \begin{cases} \overset{x{{'}}=2x}{y{{'}}=3y}\end{cases}\)后得到的曲线方程为\((\)  \()\)
              A.\(y′=3\sin \) \(2x\)
              B.\(y′=3\sin \) \(x′\)
              C.\(y′=3\sin \dfrac {1}{2}x′\)
              D.\(y′= \dfrac {1}{3}\sin \) \(2x′\)
            • 5.

              已知点\(M\)的极坐标为\(\left( 5,\dfrac{2\pi }{3} \right)\),那么将点\(M\)的极坐标化成直角坐标为\((\)    \()\)

              A.\(\left( -\dfrac{5\sqrt{3}}{2},-\dfrac{5}{2} \right)\)
              B.\(\left( -\dfrac{5\sqrt{3}}{2},\dfrac{5}{2} \right)\)
              C.\(\left( \dfrac{5}{2},\dfrac{5\sqrt{3}}{2} \right)\)
              D.\(\left( -\dfrac{5}{2},\dfrac{5\sqrt{3}}{2} \right)\)
            • 6. 在同一坐标系中,将曲线\(y=2\sin 3x\)变为曲线\(y=\sin x\)的伸缩变换是(    )
              A.\(\begin{cases} x=3x′ \\ y= \dfrac{1}{2}y′ \end{cases}\)
              B.\(\begin{cases}x{{"}}=3x & \\ y{{"}}= \dfrac{1}{2}y & \end{cases} \)
              C.\(\begin{cases} x=3x′ \\ y=2y′ \end{cases}\)
              D.\(\begin{cases} x′=3x \\ y′=2y \end{cases}\)
            • 7.

              在同一平面直角坐标系中,经过伸缩变换\(\begin{cases} & {{x}^{{{{"}}}}}=3x \\ & {{y}^{{{{"}}}}}=\dfrac{y}{2} \end{cases}\)后,曲线\(C\)变为曲线\({{y}^{{{{"}}}}}=\sin {{x}^{{{{"}}}}}\),则曲线\(C\)的方程是                                                      

              A.\(y=2\sin 3x\)
              B.\(y=\dfrac{1}{2}\sin 3x\)
              C.\(y=\dfrac{1}{2}\sin \dfrac{x}{3}\)
              D.\(y=2\sin \dfrac{x}{3}\)
            • 8.

              点\(M\)的直角坐标是\((-1, \sqrt{3})\),则点\(M\)的极坐标为\((\)  \()\)

              A.\(\left( \left. 2, \dfrac{π}{3} \right. \right)\)
              B.\(\left( \left. 2,- \dfrac{π}{3} \right. \right)\)

              C.\(\left( \left. 2, \dfrac{2π}{3} \right. \right)\)
              D.\(\left( \left. 2,2kπ+ \dfrac{2π}{3} \right. \right)\),\((k∈Z)\)
            • 9.

              将极坐标方程\({{\rho }^{2}}\cos \theta -\rho =0\)化为直角坐标方程是\((\)   \()\)

              A.\(x^{2}+y^{2}=0\)或\(y=1\)  
              B.\(x=1\)
              C.\(x^{2}+y^{2}=0\)或\(x=1\)  
              D.\(y=1\) 
            • 10.

              点\(M\)的极坐标是\(\left(2 \sqrt{2}, \dfrac{7π}{4}\right) \),则点\(M\)的直角坐标为\((\)    \()\)

              A.\(\left(2,2\right) \)
              B.\(\left(-2,2\right) \)
              C.\(\left(-2,-2\right) \)
              D.\(\left(2,-2\right) \)
            0/40

            进入组卷