一道初三函数与几何题如图,直角坐标系内的梯形AOBC,AC∥OB,S△AOC:S△BOC=1:2,且线段AC、OC满足AC+1/OB=9/4(AC≥1);(1)求AC、OB的长;(2)当角B=60°时,D为平面内一点,且点O、C、B、D能够成菱形,请
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![一道初三函数与几何题如图,直角坐标系内的梯形AOBC,AC∥OB,S△AOC:S△BOC=1:2,且线段AC、OC满足AC+1/OB=9/4(AC≥1);(1)求AC、OB的长;(2)当角B=60°时,D为平面内一点,且点O、C、B、D能够成菱形,请](/uploads/image/z/10477759-31-9.jpg?t=%E4%B8%80%E9%81%93%E5%88%9D%E4%B8%89%E5%87%BD%E6%95%B0%E4%B8%8E%E5%87%A0%E4%BD%95%E9%A2%98%E5%A6%82%E5%9B%BE%2C%E7%9B%B4%E8%A7%92%E5%9D%90%E6%A0%87%E7%B3%BB%E5%86%85%E7%9A%84%E6%A2%AF%E5%BD%A2AOBC%2CAC%E2%88%A5OB%2CS%E2%96%B3AOC%3AS%E2%96%B3BOC%3D1%3A2%2C%E4%B8%94%E7%BA%BF%E6%AE%B5AC%E3%80%81OC%E6%BB%A1%E8%B6%B3AC%2B1%2FOB%3D9%2F4%28AC%E2%89%A51%29%EF%BC%9B%EF%BC%881%EF%BC%89%E6%B1%82AC%E3%80%81OB%E7%9A%84%E9%95%BF%EF%BC%9B%EF%BC%882%EF%BC%89%E5%BD%93%E8%A7%92B%3D60%C2%B0%E6%97%B6%2CD%E4%B8%BA%E5%B9%B3%E9%9D%A2%E5%86%85%E4%B8%80%E7%82%B9%2C%E4%B8%94%E7%82%B9O%E3%80%81C%E3%80%81B%E3%80%81D%E8%83%BD%E5%A4%9F%E6%88%90%E8%8F%B1%E5%BD%A2%2C%E8%AF%B7)
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