抛物线y2=4px(p＞0)上一点M到焦点的距离为a,则M到y轴的距离为( )A.a

抛物线y²=4px(p＞0)上一点M到焦点的距离为a,则M到y轴的距离为( )

A.a-p B.a+p C.a- D.a+2p

答案

解析:由抛物线定义,点M到准线x=-p的距离为a.∴点M到y轴的距离为a-|-p|=a-p.

答案:A

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抛物线y2=4px(p＞0)上一点M到焦点的距离为a,则M到y轴的距离为( )A.a

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