DCAD2的知识精选

等腰梯形ABCD中,AB∥CD,DC=AD=2,∠A=60°,则=(  )                  ...
问题详情:等腰梯形ABCD中,AB∥CD,DC=AD=2,∠A=60°,则=()                   A.6                                 B.﹣6                       ...
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