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如图,梯形ABCD中,AD∥BC,∠B=70°,∠C=40°,作DE∥AB交BC...
如图,梯形ABCD中,AD∥BC,∠B=70°,∠C=40°,作DE∥AB交BC于点E,若AD=3,BC=10,则CD的长是
.
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