过点C作CP∥BD交AB的延长线于P. …………… 1分∵DC∥AB, ∴四边形BPCD是平行四边形. ∴DC=BP.∵AB =2DC,设DC=x,∴BP=x,AB=2x.∴AP="3x." ……………………4分[∵EF∥BD,CP∥BD,∴EF∥CP.]又...
如图,梯形ABCD中DC∥AB,AB =2DC,对角线AC、BD相交予点O,BD =4。过AC的中点H作EF∥BD分别交
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