已知圆M:x2+(y-2)2=1,设B,C是直线l:x-2y=0上的两点,它们的横坐标分别为t,t+4(t∈R),过p在作圆M的切线PA,切点为A.⑴若t=0,MP=根号5,求直线PA方程⑵经过A,P,M三点的圆的圆心是D,求线段DO长的最小值.
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![已知圆M:x2+(y-2)2=1,设B,C是直线l:x-2y=0上的两点,它们的横坐标分别为t,t+4(t∈R),过p在作圆M的切线PA,切点为A.⑴若t=0,MP=根号5,求直线PA方程⑵经过A,P,M三点的圆的圆心是D,求线段DO长的最小值.](/uploads/image/z/13431697-25-7.jpg?t=%E5%B7%B2%E7%9F%A5%E5%9C%86M%3Ax2%2B%EF%BC%88y-2%292%3D1%2C%E8%AE%BEB%2CC%E6%98%AF%E7%9B%B4%E7%BA%BFl%EF%BC%9Ax-2y%3D0%E4%B8%8A%E7%9A%84%E4%B8%A4%E7%82%B9%2C%E5%AE%83%E4%BB%AC%E7%9A%84%E6%A8%AA%E5%9D%90%E6%A0%87%E5%88%86%E5%88%AB%E4%B8%BAt%2Ct%2B4%28t%E2%88%88R%29%2C%E8%BF%87p%E5%9C%A8%E4%BD%9C%E5%9C%86M%E7%9A%84%E5%88%87%E7%BA%BFPA%2C%E5%88%87%E7%82%B9%E4%B8%BAA.%E2%91%B4%E8%8B%A5t%3D0%2CMP%3D%E6%A0%B9%E5%8F%B75%2C%E6%B1%82%E7%9B%B4%E7%BA%BFPA%E6%96%B9%E7%A8%8B%E2%91%B5%E7%BB%8F%E8%BF%87A%2CP%2CM%E4%B8%89%E7%82%B9%E7%9A%84%E5%9C%86%E7%9A%84%E5%9C%86%E5%BF%83%E6%98%AFD%2C%E6%B1%82%E7%BA%BF%E6%AE%B5DO%E9%95%BF%E7%9A%84%E6%9C%80%E5%B0%8F%E5%80%BC.)
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