初三平行线分线段成比例题目,急1.AB,CD,EF垂直于BD 求证1/AB+1/CD=1/EF 2.当AB CD EF由垂直改为互相平行时,1/AB+1/CD=1/EF还成立吗 ,为什么
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![初三平行线分线段成比例题目,急1.AB,CD,EF垂直于BD 求证1/AB+1/CD=1/EF 2.当AB CD EF由垂直改为互相平行时,1/AB+1/CD=1/EF还成立吗 ,为什么](/uploads/image/z/7676409-57-9.jpg?t=%E5%88%9D%E4%B8%89%E5%B9%B3%E8%A1%8C%E7%BA%BF%E5%88%86%E7%BA%BF%E6%AE%B5%E6%88%90%E6%AF%94%E4%BE%8B%E9%A2%98%E7%9B%AE%2C%E6%80%A51.AB%2CCD%2CEF%E5%9E%82%E7%9B%B4%E4%BA%8EBD+%E6%B1%82%E8%AF%811%2FAB%2B1%2FCD%3D1%2FEF+2.%E5%BD%93AB+CD+EF%E7%94%B1%E5%9E%82%E7%9B%B4%E6%94%B9%E4%B8%BA%E4%BA%92%E7%9B%B8%E5%B9%B3%E8%A1%8C%E6%97%B6%2C1%2FAB%2B1%2FCD%3D1%2FEF%E8%BF%98%E6%88%90%E7%AB%8B%E5%90%97+%2C%E4%B8%BA%E4%BB%80%E4%B9%88)
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