如图,AB‖CD,E为AD上的一点,若______,则AB+CD=BC.(要求在等式∠A=90°,∠1=∠2,∠3=∠4,BE=CE,AE=DE中选择两个等式填在横线上).
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![如图,AB‖CD,E为AD上的一点,若______,则AB+CD=BC.(要求在等式∠A=90°,∠1=∠2,∠3=∠4,BE=CE,AE=DE中选择两个等式填在横线上).](/uploads/image/z/11529761-41-1.jpg?t=%E5%A6%82%E5%9B%BE%2CAB%E2%80%96CD%2CE%E4%B8%BAAD%E4%B8%8A%E7%9A%84%E4%B8%80%E7%82%B9%2C%E8%8B%A5______%2C%E5%88%99AB%2BCD%3DBC.%28%E8%A6%81%E6%B1%82%E5%9C%A8%E7%AD%89%E5%BC%8F%E2%88%A0A%3D90%C2%B0%2C%E2%88%A01%3D%E2%88%A02%2C%E2%88%A03%EF%BC%9D%E2%88%A04%2CBE%EF%BC%9DCE%2CAE%EF%BC%9DDE%E4%B8%AD%E9%80%89%E6%8B%A9%E4%B8%A4%E4%B8%AA%E7%AD%89%E5%BC%8F%E5%A1%AB%E5%9C%A8%E6%A8%AA%E7%BA%BF%E4%B8%8A%EF%BC%89.)
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