用两条细绳共同悬吊一个重物,已知AB=20cm,AC=15cm,BC=25cm,AC是墙壁,B端悬挂重物竖直向下,求AB拉力与BC拉力~
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![用两条细绳共同悬吊一个重物,已知AB=20cm,AC=15cm,BC=25cm,AC是墙壁,B端悬挂重物竖直向下,求AB拉力与BC拉力~](/uploads/image/z/15166526-14-6.jpg?t=%E7%94%A8%E4%B8%A4%E6%9D%A1%E7%BB%86%E7%BB%B3%E5%85%B1%E5%90%8C%E6%82%AC%E5%90%8A%E4%B8%80%E4%B8%AA%E9%87%8D%E7%89%A9%2C%E5%B7%B2%E7%9F%A5AB%3D20cm%2CAC%3D15cm%2CBC%3D25cm%2CAC%E6%98%AF%E5%A2%99%E5%A3%81%2CB%E7%AB%AF%E6%82%AC%E6%8C%82%E9%87%8D%E7%89%A9%E7%AB%96%E7%9B%B4%E5%90%91%E4%B8%8B%2C%E6%B1%82AB%E6%8B%89%E5%8A%9B%E4%B8%8EBC%E6%8B%89%E5%8A%9B%7E)
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