以下面各点为顶点,画一画,最多能画出几个三角形?1、本图中共9个点.2、用排列组合是否C9、3=P9、3/P3、3=84?3、那从9个点中选3个点却有28种选法?我实在搞不明白.4、经过认真计算,确有84个,
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/27 17:30:32
![以下面各点为顶点,画一画,最多能画出几个三角形?1、本图中共9个点.2、用排列组合是否C9、3=P9、3/P3、3=84?3、那从9个点中选3个点却有28种选法?我实在搞不明白.4、经过认真计算,确有84个,](/uploads/image/z/1096411-67-1.jpg?t=%E4%BB%A5%E4%B8%8B%E9%9D%A2%E5%90%84%E7%82%B9%E4%B8%BA%E9%A1%B6%E7%82%B9%2C%E7%94%BB%E4%B8%80%E7%94%BB%2C%E6%9C%80%E5%A4%9A%E8%83%BD%E7%94%BB%E5%87%BA%E5%87%A0%E4%B8%AA%E4%B8%89%E8%A7%92%E5%BD%A2%3F1%E3%80%81%E6%9C%AC%E5%9B%BE%E4%B8%AD%E5%85%B19%E4%B8%AA%E7%82%B9.2%E3%80%81%E7%94%A8%E6%8E%92%E5%88%97%E7%BB%84%E5%90%88%E6%98%AF%E5%90%A6C9%E3%80%813%3DP9%E3%80%813%2FP3%E3%80%813%3D84%3F3%E3%80%81%E9%82%A3%E4%BB%8E9%E4%B8%AA%E7%82%B9%E4%B8%AD%E9%80%893%E4%B8%AA%E7%82%B9%E5%8D%B4%E6%9C%8928%E7%A7%8D%E9%80%89%E6%B3%95%3F%E6%88%91%E5%AE%9E%E5%9C%A8%E6%90%9E%E4%B8%8D%E6%98%8E%E7%99%BD.4%E3%80%81%E7%BB%8F%E8%BF%87%E8%AE%A4%E7%9C%9F%E8%AE%A1%E7%AE%97%EF%BC%8C%E7%A1%AE%E6%9C%8984%E4%B8%AA%EF%BC%8C)
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