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(1)∵DE∥BC∴△ADE∽△ABC∴AD:AB=DE:BC∵AD:DB=3:2,∴∴AD:AB=3:5∴DE:BC=3:5;(2)∵△ADE∽△ABC,∴S△ADE:S△ABC=9:25,∴S△ADES四邊形BCED=916.
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