都是解答题,清给出一些步鄹.当然,1.已知O〔0,0〕B〔1,0〕C〔b,c〕是△ABC的三个顶点,写出△OBC的重心G,垂心H,外心F的坐标,并证明这三点共线.2.已知正方形ABCD,BE‖AC,AC=CE,EC的延长线交BA的延长线
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![都是解答题,清给出一些步鄹.当然,1.已知O〔0,0〕B〔1,0〕C〔b,c〕是△ABC的三个顶点,写出△OBC的重心G,垂心H,外心F的坐标,并证明这三点共线.2.已知正方形ABCD,BE‖AC,AC=CE,EC的延长线交BA的延长线](/uploads/image/z/5166982-46-2.jpg?t=%E9%83%BD%E6%98%AF%E8%A7%A3%E7%AD%94%E9%A2%98%2C%E6%B8%85%E7%BB%99%E5%87%BA%E4%B8%80%E4%BA%9B%E6%AD%A5%E9%84%B9.%E5%BD%93%E7%84%B6%2C1.%E5%B7%B2%E7%9F%A5O%E3%80%940%2C0%E3%80%95B%E3%80%941%2C0%E3%80%95C%E3%80%94b%2Cc%E3%80%95%E6%98%AF%E2%96%B3ABC%E7%9A%84%E4%B8%89%E4%B8%AA%E9%A1%B6%E7%82%B9%2C%E5%86%99%E5%87%BA%E2%96%B3OBC%E7%9A%84%E9%87%8D%E5%BF%83G%2C%E5%9E%82%E5%BF%83H%2C%E5%A4%96%E5%BF%83F%E7%9A%84%E5%9D%90%E6%A0%87%2C%E5%B9%B6%E8%AF%81%E6%98%8E%E8%BF%99%E4%B8%89%E7%82%B9%E5%85%B1%E7%BA%BF.2.%E5%B7%B2%E7%9F%A5%E6%AD%A3%E6%96%B9%E5%BD%A2ABCD%2CBE%E2%80%96AC%2CAC%3DCE%2CEC%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%A4BA%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF)
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