优优班--学霸训练营 > 知识点挑题
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            • 1.

              已知点\(P\left( x,y \right)\)为曲线\(C\):\(\begin{cases} & x=-1+2\cos \theta , \\ & y=1+2\sin \theta . \end{cases}(\theta \)为参数\()\)上的动点,则\(3x+4y\)的最小值为\((\)     \()\)

              A.\(-9\)               
              B.\(11\)             
              C.\(-10\)               
              D.\(-11\)
            • 2.

              已知曲线\(C\)的参数方程为\(\begin{cases} x=2+\cos \theta \\ y=1+\sin \theta \end{cases}(\theta \)为参数且\(\theta \in [0,2\pi ])\),点\(P(x,y)\)在曲线\(C\)上,则\(\dfrac{y+x-1}{x}\)的最大值是

              A.\(\dfrac{\sqrt{3}}{3}\)                        
              B.\(\dfrac{\sqrt{3}}{2}\)

              C.\(\dfrac{2+\sqrt{3}}{2}\)                      
              D.\(\dfrac{3+\sqrt{3}}{3}\)
            • 3.

              设曲线 \(C\) 的参数方程为\(\begin{cases} & x=2+3\cos \theta \\ & y=1+3\sin \theta \end{cases}(θ \) 为参数\()\),直线 \(l\) 的方程为\(x-3y+2=0 \),则曲线 \(C\) 上到直线 \(l\) 距离为\(\dfrac{7}{10}\sqrt{10}\)的点的个数为

              A.\(1\)
              B.\(2\)
              C.\(3\)
              D.\(4\)
            • 4.

              设曲线\(C:\begin{cases}x=2\cos ϕ \\ y= \sqrt{3}\sin ϕ\end{cases} (ϕ \)为参数\()\)与\(x\)轴的交点分别为\(M\),\(N\),点\(P\)是曲线\(C\)上的动点,且点\(P\)不在坐标轴上,则直线\(PM\)与\(PN\)的斜率之积为\((\)   \()\)

              A.\(\dfrac{4}{3}\)
              B.\(-\dfrac{4}{3}\)
              C.\(\dfrac{3}{4}\)
              D.\(-\dfrac{3}{4}\)
            • 5.

              已知\(M\)为曲线\(C:{ }\!\!\{\!\!{ }\begin{matrix} x=3+\sin \theta \\ y=\cos \theta \\\end{matrix}{ }(\theta \)为参数\()\)上的动点,设\(O\)为原点,则\(\left| OM \right|\)的最大值是

              A.\(1\)   
              B.\(2\)   
              C.\(3\)   
              D.\(4\)
            • 6.
              曲线\(\begin{cases} & x=5\cos \theta \\ & y=5\sin \theta \\ \end{cases}(\dfrac{\pi }{3}\leqslant \theta \leqslant \pi )\)的长度是(    )
              A.\(5π\)     
              B.\(10π\)    
              C.\( \dfrac{5π}{3} \)
              D.\( \dfrac{10π}{3} \)
            • 7.

              \(P\)\((1,0)\)到曲线\(\begin{cases}x={t}^{2} \\ y=2t\end{cases} (\)参数\(t\)\(∈R)\)上的点的最短距离为(    )

              A.\(0\)          
              B.\(1\)           
              C.\( \sqrt{2} \)
              D.\(2\)
            • 8.

              曲线\(\begin{cases}x=-1+\cos θ \\ y=2+\sin θ\end{cases} (θ\)为参数\()\)的对称中心(    )

              A.在直线\(y=2x\)上   
              B.在直线\(y=-2x\)上
              C.在直线\(y=x-1\)上  
              D.在直线\(y=x+1\)上
            • 9.

              已知实数\(x\),\(y\)满足\({{(x-3)}^{2}}+{{(y-4)}^{2}}=9\),则\(z=3x+4y\)的最大值为\((\)   \()\)

              A.\(10\)   
              B.\(15\)    
              C.\(25\)    
              D.\(40\)
            • 10. 将正弦曲线 \(y\)\(=\) \(\sin x\)作如下变换\(\begin{cases} {x}{{"}}=\dfrac{1}{2}x \\ {y}{{"}}=3y \\\end{cases}\)得到的曲线方程为(    )
              A.\(y\)\(′=3\) \(\sin \)\(\dfrac{1}{2}\) \(x\)\(′\)      
              B.\(y\)\(′= \dfrac{1}{3} \) \(\sin \)\(2\) \(x\)\(′\)       
              C.\(y\)\(′=\dfrac{1}{2}\) \(\sin \)\(2\) \(x\)\(′\)       
              D.\(y\)\(′=3\) \(\sin \)\(2\) \(x\)\(′\)
            0/40

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