已知梯形ABCD,AD平行BC,AB⊥BC,AD=1,AB=2,BC=3.(1)若P为AB边上任意一点,延长PD到E,使DE=PD,再以PE、PC为边作平行四边形PCQE,请探究对角线PQ的长是否存在最小值?如果存在,求出最小值,如果不存在,说明
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