空间向量求二面角对一个平面求出其法向量以后,怎么判断它是穿入还是穿出这个平面啊?比如n=(1,2,2)是从原点指向点(1,2,2)么?那么从原点指出来的向量对任何一个平面不都是穿入的吗?(我
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![空间向量求二面角对一个平面求出其法向量以后,怎么判断它是穿入还是穿出这个平面啊?比如n=(1,2,2)是从原点指向点(1,2,2)么?那么从原点指出来的向量对任何一个平面不都是穿入的吗?(我](/uploads/image/z/4035343-31-3.jpg?t=%E7%A9%BA%E9%97%B4%E5%90%91%E9%87%8F%E6%B1%82%E4%BA%8C%E9%9D%A2%E8%A7%92%E5%AF%B9%E4%B8%80%E4%B8%AA%E5%B9%B3%E9%9D%A2%E6%B1%82%E5%87%BA%E5%85%B6%E6%B3%95%E5%90%91%E9%87%8F%E4%BB%A5%E5%90%8E%2C%E6%80%8E%E4%B9%88%E5%88%A4%E6%96%AD%E5%AE%83%E6%98%AF%E7%A9%BF%E5%85%A5%E8%BF%98%E6%98%AF%E7%A9%BF%E5%87%BA%E8%BF%99%E4%B8%AA%E5%B9%B3%E9%9D%A2%E5%95%8A%3F%E6%AF%94%E5%A6%82n%3D%281%2C2%2C2%29%E6%98%AF%E4%BB%8E%E5%8E%9F%E7%82%B9%E6%8C%87%E5%90%91%E7%82%B9%281%2C2%2C2%29%E4%B9%88%EF%BC%9F%E9%82%A3%E4%B9%88%E4%BB%8E%E5%8E%9F%E7%82%B9%E6%8C%87%E5%87%BA%E6%9D%A5%E7%9A%84%E5%90%91%E9%87%8F%E5%AF%B9%E4%BB%BB%E4%BD%95%E4%B8%80%E4%B8%AA%E5%B9%B3%E9%9D%A2%E4%B8%8D%E9%83%BD%E6%98%AF%E7%A9%BF%E5%85%A5%E7%9A%84%E5%90%97%EF%BC%9F%EF%BC%88%E6%88%91)
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