如图，▱ABCD，E是BA延长线上一点，AB=AE，连接CE交AD于点F，若CF平分∠BCD，AB=3，则BC的长为____________．
计算：×=________．
计算：×=_______
计算：=________．
计算：=_______
×
=________．
×
=_______
=________．
=_______
×
=_______
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