求点P(3,5)关于直线L:X-3y+2=0对称的点的坐标设点Q为对称点(x0,y0)解里面有句,(3+x0)/2- 3*(5+y0)/2+2=0 这句话怎么来的看不懂,用了什么公式
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![求点P(3,5)关于直线L:X-3y+2=0对称的点的坐标设点Q为对称点(x0,y0)解里面有句,(3+x0)/2- 3*(5+y0)/2+2=0 这句话怎么来的看不懂,用了什么公式](/uploads/image/z/11420639-71-9.jpg?t=%E6%B1%82%E7%82%B9P%283%2C5%29%E5%85%B3%E4%BA%8E%E7%9B%B4%E7%BA%BFL%3AX-3y%2B2%3D0%E5%AF%B9%E7%A7%B0%E7%9A%84%E7%82%B9%E7%9A%84%E5%9D%90%E6%A0%87%E8%AE%BE%E7%82%B9Q%E4%B8%BA%E5%AF%B9%E7%A7%B0%E7%82%B9%EF%BC%88x0%2Cy0%EF%BC%89%E8%A7%A3%E9%87%8C%E9%9D%A2%E6%9C%89%E5%8F%A5%2C%283%2Bx0%29%2F2-+3%2A%285%2By0%29%2F2%2B2%3D0+%E8%BF%99%E5%8F%A5%E8%AF%9D%E6%80%8E%E4%B9%88%E6%9D%A5%E7%9A%84%E7%9C%8B%E4%B8%8D%E6%87%82%2C%E7%94%A8%E4%BA%86%E4%BB%80%E4%B9%88%E5%85%AC%E5%BC%8F)
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