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(2007•乌鲁木齐)如图,将等腰梯形ABCD的腰AB平移到DE的位置,若∠B=...
(2007•乌鲁木齐)如图,将等腰梯形ABCD的腰AB平移到DE的位置,若∠B=60°,AB=6,则EC=
.
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