抛物线 y²=2Px.(P>0)上一点M到焦点的距离是a(a>p/2)则点M到准线的距离是 点M的横线坐标是
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![抛物线 y²=2Px.(P>0)上一点M到焦点的距离是a(a>p/2)则点M到准线的距离是 点M的横线坐标是](/uploads/image/z/3815537-41-7.jpg?t=%E6%8A%9B%E7%89%A9%E7%BA%BF+y%26%23178%3B%3D2Px.%EF%BC%88P%EF%BC%9E0%EF%BC%89%E4%B8%8A%E4%B8%80%E7%82%B9M%E5%88%B0%E7%84%A6%E7%82%B9%E7%9A%84%E8%B7%9D%E7%A6%BB%E6%98%AFa%EF%BC%88a%EF%BC%9Ep%2F2%EF%BC%89%E5%88%99%E7%82%B9M%E5%88%B0%E5%87%86%E7%BA%BF%E7%9A%84%E8%B7%9D%E7%A6%BB%E6%98%AF+%E7%82%B9M%E7%9A%84%E6%A8%AA%E7%BA%BF%E5%9D%90%E6%A0%87%E6%98%AF)
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抛物线 y²=2Px.(P>0)上一点M到焦点的距离是a(a>p/2)则点M到准线的距离是 点M的横线坐标是
抛物线 y²=2Px.(P>0)上一点M到焦点的距离是a(a>p/2)则点M到准线的距离是 点M的横线坐标是
抛物线 y²=2Px.(P>0)上一点M到焦点的距离是a(a>p/2)则点M到准线的距离是 点M的横线坐标是
答:
抛物线上点到焦点的距离等于其到准线的距离
所以:点M到准线的距离是a
抛物线y^2=2px的准线x=-p/2
则点M的横坐标x满足:x-(-p/2)=a
x=a+p/2