一道初中数学题,大家帮忙解答一下.小明在做题时发现了这样一个规律:如图,在边长为a的等边三角形ABC的内部,随意找一P,过点P作PD‖AB,PE‖BC,PF‖AC,无论P取在什么位置,PD+PE+PF都等于a,这难道是
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![一道初中数学题,大家帮忙解答一下.小明在做题时发现了这样一个规律:如图,在边长为a的等边三角形ABC的内部,随意找一P,过点P作PD‖AB,PE‖BC,PF‖AC,无论P取在什么位置,PD+PE+PF都等于a,这难道是](/uploads/image/z/531768-48-8.jpg?t=%E4%B8%80%E9%81%93%E5%88%9D%E4%B8%AD%E6%95%B0%E5%AD%A6%E9%A2%98%2C%E5%A4%A7%E5%AE%B6%E5%B8%AE%E5%BF%99%E8%A7%A3%E7%AD%94%E4%B8%80%E4%B8%8B.%E5%B0%8F%E6%98%8E%E5%9C%A8%E5%81%9A%E9%A2%98%E6%97%B6%E5%8F%91%E7%8E%B0%E4%BA%86%E8%BF%99%E6%A0%B7%E4%B8%80%E4%B8%AA%E8%A7%84%E5%BE%8B%3A%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E8%BE%B9%E9%95%BF%E4%B8%BAa%E7%9A%84%E7%AD%89%E8%BE%B9%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E7%9A%84%E5%86%85%E9%83%A8%2C%E9%9A%8F%E6%84%8F%E6%89%BE%E4%B8%80P%2C%E8%BF%87%E7%82%B9P%E4%BD%9CPD%E2%80%96AB%2CPE%E2%80%96BC%2CPF%E2%80%96AC%2C%E6%97%A0%E8%AE%BAP%E5%8F%96%E5%9C%A8%E4%BB%80%E4%B9%88%E4%BD%8D%E7%BD%AE%2CPD%2BPE%2BPF%E9%83%BD%E7%AD%89%E4%BA%8Ea%2C%E8%BF%99%E9%9A%BE%E9%81%93%E6%98%AF)
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