1.圆x^2+y^2-2x-6y+9=0关于直线2x+y+5=0的对称方程是:A.:(x+7)^2+(y+1)^2=1 B.:(x+7)^2+(y+2)^2=1 C.:(x+6)^2+(y+2)^2=1 D.:(x+6)^2+(y-2)^2=1 2.一束光线从点A(-2,1)出发经x轴反射到圆C:(x-2)^2+(y-2)^2=1上,光线的最短路程为____
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![1.圆x^2+y^2-2x-6y+9=0关于直线2x+y+5=0的对称方程是:A.:(x+7)^2+(y+1)^2=1 B.:(x+7)^2+(y+2)^2=1 C.:(x+6)^2+(y+2)^2=1 D.:(x+6)^2+(y-2)^2=1 2.一束光线从点A(-2,1)出发经x轴反射到圆C:(x-2)^2+(y-2)^2=1上,光线的最短路程为____](/uploads/image/z/5183911-55-1.jpg?t=1.%E5%9C%86x%5E2%2By%5E2-2x-6y%2B9%3D0%E5%85%B3%E4%BA%8E%E7%9B%B4%E7%BA%BF2x%2By%2B5%3D0%E7%9A%84%E5%AF%B9%E7%A7%B0%E6%96%B9%E7%A8%8B%E6%98%AF%EF%BC%9AA.%3A%28x%2B7%29%5E2%2B%28y%2B1%29%5E2%3D1+B.%3A%28x%2B7%29%5E2%2B%28y%2B2%29%5E2%3D1+C.%3A%28x%2B6%29%5E2%2B%28y%2B2%29%5E2%3D1+D.%3A%28x%2B6%29%5E2%2B%28y-2%29%5E2%3D1+2.%E4%B8%80%E6%9D%9F%E5%85%89%E7%BA%BF%E4%BB%8E%E7%82%B9A%28-2%2C1%29%E5%87%BA%E5%8F%91%E7%BB%8Fx%E8%BD%B4%E5%8F%8D%E5%B0%84%E5%88%B0%E5%9C%86C%3A%28x-2%29%5E2%2B%28y-2%29%5E2%3D1%E4%B8%8A%2C%E5%85%89%E7%BA%BF%E7%9A%84%E6%9C%80%E7%9F%AD%E8%B7%AF%E7%A8%8B%E4%B8%BA____)
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1.圆x^2+y^2-2x-6y+9=0关于直线2x+y+5=0的对称方程是:A.:(x+7)^2+(y+1)^2=1 B.:(x+7)^2+(y+2)^2=1 C.:(x+6)^2+(y+2)^2=1 D.:(x+6)^2+(y-2)^2=1 2.一束光线从点A(-2,1)出发经x轴反射到圆C:(x-2)^2+(y-2)^2=1上,光线的最短路程为____
1.圆x^2+y^2-2x-6y+9=0关于直线2x+y+5=0的对称方程是:A.:(x+7)^2+(y+1)^2=1 B.:(x+7)^2+(y+2)^2=1 C.:(x+6)^2+(y+2)^2=1 D.:(x+6)^2+(y-2)^2=1 2.一束光线从点A(-2,1)出发经x轴反射到圆C:(x-2)^2+(y-2)^2=1上,光线的最短路程为______ 3.已知圆C的方程为x^2+y^2-2y-3=0,过点P(-1,2)的直线l与圆C交于A,B两点,若使 │AB│最小,则直线的方程是______
1.圆x^2+y^2-2x-6y+9=0关于直线2x+y+5=0的对称方程是:A.:(x+7)^2+(y+1)^2=1 B.:(x+7)^2+(y+2)^2=1 C.:(x+6)^2+(y+2)^2=1 D.:(x+6)^2+(y-2)^2=1 2.一束光线从点A(-2,1)出发经x轴反射到圆C:(x-2)^2+(y-2)^2=1上,光线的最短路程为____
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