当绳子AB使杠杆处于图所示位置时,AB=4,OB=3若绳子AB拉力是30N,则灯的重力是多少?,
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![当绳子AB使杠杆处于图所示位置时,AB=4,OB=3若绳子AB拉力是30N,则灯的重力是多少?,](/uploads/image/z/8159906-2-6.jpg?t=%E5%BD%93%E7%BB%B3%E5%AD%90AB%E4%BD%BF%E6%9D%A0%E6%9D%86%E5%A4%84%E4%BA%8E%E5%9B%BE%E6%89%80%E7%A4%BA%E4%BD%8D%E7%BD%AE%E6%97%B6%2CAB%3D4%2COB%3D3%E8%8B%A5%E7%BB%B3%E5%AD%90AB%E6%8B%89%E5%8A%9B%E6%98%AF30N%2C%E5%88%99%E7%81%AF%E7%9A%84%E9%87%8D%E5%8A%9B%E6%98%AF%E5%A4%9A%E5%B0%91%3F%2C)
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