如图所示,梯形ABCD的对角线AC,BD相交于O,G是BD的中点.若AD=3,BC=9,求GO:BG的值.
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![如图所示,梯形ABCD的对角线AC,BD相交于O,G是BD的中点.若AD=3,BC=9,求GO:BG的值.](/uploads/image/z/9503228-20-8.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E6%A2%AF%E5%BD%A2ABCD%E7%9A%84%E5%AF%B9%E8%A7%92%E7%BA%BFAC%2CBD%E7%9B%B8%E4%BA%A4%E4%BA%8EO%2CG%E6%98%AFBD%E7%9A%84%E4%B8%AD%E7%82%B9.%E8%8B%A5AD%3D3%2CBC%3D9%2C%E6%B1%82GO%EF%BC%9ABG%E7%9A%84%E5%80%BC.)
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