在梯形ABCD中,AD‖BC,∠BAD=90°,AD+AB=14,(AB>AD) BD=10,BD =DC,27.如图,在梯形ABCD中,AD‖BC,∠BAD=90°,AD+AB=14,(AB>AD)BD=10,BD =DC,E、F分别是BC、CD上的点,且CE+CF = 4.(1) 求BC的长;(2) 设EC的长为x,四边形AEFD
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![在梯形ABCD中,AD‖BC,∠BAD=90°,AD+AB=14,(AB>AD) BD=10,BD =DC,27.如图,在梯形ABCD中,AD‖BC,∠BAD=90°,AD+AB=14,(AB>AD)BD=10,BD =DC,E、F分别是BC、CD上的点,且CE+CF = 4.(1) 求BC的长;(2) 设EC的长为x,四边形AEFD](/uploads/image/z/8801011-19-1.jpg?t=%E5%9C%A8%E6%A2%AF%E5%BD%A2ABCD%E4%B8%AD%2CAD%E2%80%96BC%2C%E2%88%A0BAD%3D90%C2%B0%2CAD%2BAB%3D14%2C%EF%BC%88AB%3EAD%EF%BC%89+BD%3D10%2CBD+%3DDC%2C27%EF%BC%8E%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E6%A2%AF%E5%BD%A2ABCD%E4%B8%AD%2CAD%E2%80%96BC%2C%E2%88%A0BAD%3D90%C2%B0%2CAD%2BAB%3D14%2C%EF%BC%88AB%3EAD%EF%BC%89BD%3D10%2CBD+%3DDC%2CE%E3%80%81F%E5%88%86%E5%88%AB%E6%98%AFBC%E3%80%81CD%E4%B8%8A%E7%9A%84%E7%82%B9%2C%E4%B8%94CE%2BCF+%3D+4%EF%BC%8E%281%29+%E6%B1%82BC%E7%9A%84%E9%95%BF%EF%BC%9B%282%29+%E8%AE%BEEC%E7%9A%84%E9%95%BF%E4%B8%BAx%2C%E5%9B%9B%E8%BE%B9%E5%BD%A2AEFD)
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