如图,BD是∠ABC的平分线,DE垂直AB,DF垂直BC如图,BD是∠ABC的平分线,DE垂直AB,DF垂直BC,垂足分别为E,F,△ABC的面积=36cm²,AB=18cm,BC=12cm.求DE的长.
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![如图,BD是∠ABC的平分线,DE垂直AB,DF垂直BC如图,BD是∠ABC的平分线,DE垂直AB,DF垂直BC,垂足分别为E,F,△ABC的面积=36cm²,AB=18cm,BC=12cm.求DE的长.](/uploads/image/z/9573108-60-8.jpg?t=%E5%A6%82%E5%9B%BE%2CBD%E6%98%AF%E2%88%A0ABC%E7%9A%84%E5%B9%B3%E5%88%86%E7%BA%BF%2CDE%E5%9E%82%E7%9B%B4AB%2CDF%E5%9E%82%E7%9B%B4BC%E5%A6%82%E5%9B%BE%2CBD%E6%98%AF%E2%88%A0ABC%E7%9A%84%E5%B9%B3%E5%88%86%E7%BA%BF%2CDE%E5%9E%82%E7%9B%B4AB%2CDF%E5%9E%82%E7%9B%B4BC%2C%E5%9E%82%E8%B6%B3%E5%88%86%E5%88%AB%E4%B8%BAE%2CF%2C%E2%96%B3ABC%E7%9A%84%E9%9D%A2%E7%A7%AF%3D36cm%26%23178%3B%2CAB%3D18cm%2CBC%3D12cm.%E6%B1%82DE%E7%9A%84%E9%95%BF.)
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