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(2010•绵阳)如图,梯形ABCD的对角线AC、BD相交于O,G是BD的中点....
(2010•绵阳)如图,梯形ABCD的对角线AC、BD相交于O,G是BD的中点.若AD=3,BC=9,则GO:BG=( )
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A.1:2
B.1:3
C.2:3
D.11:20
考点分析:
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