在梯形ABCD中,AD平行BC,角D=90°,且AD=7,BC=17,AB=26(1)求梯形ABCD的面积(2)若点M为AB的中点,N为DC边上一点,且DN=7,求MN的长
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![在梯形ABCD中,AD平行BC,角D=90°,且AD=7,BC=17,AB=26(1)求梯形ABCD的面积(2)若点M为AB的中点,N为DC边上一点,且DN=7,求MN的长](/uploads/image/z/11468328-24-8.jpg?t=%E5%9C%A8%E6%A2%AF%E5%BD%A2ABCD%E4%B8%AD%2CAD%E5%B9%B3%E8%A1%8CBC%2C%E8%A7%92D%3D90%C2%B0%2C%E4%B8%94AD%3D7%2CBC%3D17%2CAB%3D26%EF%BC%881%EF%BC%89%E6%B1%82%E6%A2%AF%E5%BD%A2ABCD%E7%9A%84%E9%9D%A2%E7%A7%AF%EF%BC%882%EF%BC%89%E8%8B%A5%E7%82%B9M%E4%B8%BAAB%E7%9A%84%E4%B8%AD%E7%82%B9%2CN%E4%B8%BADC%E8%BE%B9%E4%B8%8A%E4%B8%80%E7%82%B9%2C%E4%B8%94DN%3D7%2C%E6%B1%82MN%E7%9A%84%E9%95%BF)
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