如图,△ABC中,AB=17,AC=10,BC=9,AD⊥BC交BC的延长线于D,求AD的长看不懂什么COS。能不能用初二学生能听懂的来讲下,
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![如图,△ABC中,AB=17,AC=10,BC=9,AD⊥BC交BC的延长线于D,求AD的长看不懂什么COS。能不能用初二学生能听懂的来讲下,](/uploads/image/z/1521785-65-5.jpg?t=%E5%A6%82%E5%9B%BE%2C%E2%96%B3ABC%E4%B8%AD%2CAB%3D17%2CAC%3D10%2CBC%3D9%2CAD%E2%8A%A5BC%E4%BA%A4BC%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%8ED%2C%E6%B1%82AD%E7%9A%84%E9%95%BF%E7%9C%8B%E4%B8%8D%E6%87%82%E4%BB%80%E4%B9%88COS%E3%80%82%E8%83%BD%E4%B8%8D%E8%83%BD%E7%94%A8%E5%88%9D%E4%BA%8C%E5%AD%A6%E7%94%9F%E8%83%BD%E5%90%AC%E6%87%82%E7%9A%84%E6%9D%A5%E8%AE%B2%E4%B8%8B%EF%BC%8C)
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