5.已知S△DOC=15平方厘米,BO=23 BD.求梯形的面积.图 见:http://hi.baidu.com/%D3%CE%CF%C0%D6%AF%CC%EC/blog/item/2952bd80325a54d2bd3e1e2e.html#
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![5.已知S△DOC=15平方厘米,BO=23 BD.求梯形的面积.图 见:http://hi.baidu.com/%D3%CE%CF%C0%D6%AF%CC%EC/blog/item/2952bd80325a54d2bd3e1e2e.html#](/uploads/image/z/8913356-44-6.jpg?t=5%EF%BC%8E%E5%B7%B2%E7%9F%A5S%E2%96%B3DOC%EF%BC%9D15%E5%B9%B3%E6%96%B9%E5%8E%98%E7%B1%B3%2CBO%EF%BC%9D23+BD.%E6%B1%82%E6%A2%AF%E5%BD%A2%E7%9A%84%E9%9D%A2%E7%A7%AF.%E5%9B%BE+%E8%A7%81%EF%BC%9Ahttp%3A%2F%2Fhi.baidu.com%2F%25D3%25CE%25CF%25C0%25D6%25AF%25CC%25EC%2Fblog%2Fitem%2F2952bd80325a54d2bd3e1e2e.html%23)
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