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Mathematical rectangular problem solving
(1) As shown in the figure, connect DE, pass B as BF∑DE and pass AD as F, then point F is what you want; (2)∵ Quadrilateral ABCD is a parallelogram, ∴AD∥BC, that is, df∨be, DE: BF, ∴ Quadrilateral BEDF is a parallelogram, ∴ DF = be.
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