阅读下列材料:在平面直角坐标系中,若点P1(x1,y1),P2(x2,y2)关于点M(x,y)中心对称(有图)—— 2012-08-02 16:07 许颖芝 | 分类:数学 | 浏览2633次向左转|向右转则x=(x1+ x2)/2,y=(y1+y2)/2.根据
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![阅读下列材料:在平面直角坐标系中,若点P1(x1,y1),P2(x2,y2)关于点M(x,y)中心对称(有图)—— 2012-08-02 16:07 许颖芝 | 分类:数学 | 浏览2633次向左转|向右转则x=(x1+ x2)/2,y=(y1+y2)/2.根据](/uploads/image/z/10155783-39-3.jpg?t=%E9%98%85%E8%AF%BB%E4%B8%8B%E5%88%97%E6%9D%90%E6%96%99%EF%BC%9A%E5%9C%A8%E5%B9%B3%E9%9D%A2%E7%9B%B4%E8%A7%92%E5%9D%90%E6%A0%87%E7%B3%BB%E4%B8%AD%2C%E8%8B%A5%E7%82%B9P1%EF%BC%88x1%2Cy1%EF%BC%89%2CP2%EF%BC%88x2%2Cy2%EF%BC%89%E5%85%B3%E4%BA%8E%E7%82%B9M%EF%BC%88x%2Cy%EF%BC%89%E4%B8%AD%E5%BF%83%E5%AF%B9%E7%A7%B0%EF%BC%88%E6%9C%89%E5%9B%BE%EF%BC%89%E2%80%94%E2%80%94+2012-08-02+16%3A07+%E8%AE%B8%E9%A2%96%E8%8A%9D+%7C+%E5%88%86%E7%B1%BB%EF%BC%9A%E6%95%B0%E5%AD%A6+%7C+%E6%B5%8F%E8%A7%882633%E6%AC%A1%E5%90%91%E5%B7%A6%E8%BD%AC%7C%E5%90%91%E5%8F%B3%E8%BD%AC%E5%88%99x%3D%EF%BC%88x1%2B+x2%EF%BC%89%2F2%2Cy%3D%28y1%2By2%29%2F2.%E6%A0%B9%E6%8D%AE)
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