三角形ABC为直角三角形,角B=90度,角C=30度,BC=5倍根号3 E、F点分别从AB、CA出发,沿AB、CA方向运动,E点为每秒1cm,F点为每秒2cm,过F点作FD垂直BC于D,求证四边形AFDH为平形四边形,当运动时间为多少时三
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![三角形ABC为直角三角形,角B=90度,角C=30度,BC=5倍根号3 E、F点分别从AB、CA出发,沿AB、CA方向运动,E点为每秒1cm,F点为每秒2cm,过F点作FD垂直BC于D,求证四边形AFDH为平形四边形,当运动时间为多少时三](/uploads/image/z/5201214-6-4.jpg?t=%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%BA%E7%9B%B4%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2%2C%E8%A7%92B%3D90%E5%BA%A6%2C%E8%A7%92C%3D30%E5%BA%A6%2CBC%3D5%E5%80%8D%E6%A0%B9%E5%8F%B73+E%E3%80%81F%E7%82%B9%E5%88%86%E5%88%AB%E4%BB%8EAB%E3%80%81CA%E5%87%BA%E5%8F%91%2C%E6%B2%BFAB%E3%80%81CA%E6%96%B9%E5%90%91%E8%BF%90%E5%8A%A8%2CE%E7%82%B9%E4%B8%BA%E6%AF%8F%E7%A7%921cm%2CF%E7%82%B9%E4%B8%BA%E6%AF%8F%E7%A7%922cm%2C%E8%BF%87F%E7%82%B9%E4%BD%9CFD%E5%9E%82%E7%9B%B4BC%E4%BA%8ED%2C%E6%B1%82%E8%AF%81%E5%9B%9B%E8%BE%B9%E5%BD%A2AFDH%E4%B8%BA%E5%B9%B3%E5%BD%A2%E5%9B%9B%E8%BE%B9%E5%BD%A2%2C%E5%BD%93%E8%BF%90%E5%8A%A8%E6%97%B6%E9%97%B4%E4%B8%BA%E5%A4%9A%E5%B0%91%E6%97%B6%E4%B8%89)
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