BD是∠ABC的平分线,DE⊥AB于点E,DF⊥BC于点F,S△ABC=99c㎡,AB=18cm,BC=15cm,求DE的长,我已经证明了∠1∠2全等
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![BD是∠ABC的平分线,DE⊥AB于点E,DF⊥BC于点F,S△ABC=99c㎡,AB=18cm,BC=15cm,求DE的长,我已经证明了∠1∠2全等](/uploads/image/z/10107146-2-6.jpg?t=BD%E6%98%AF%E2%88%A0ABC%E7%9A%84%E5%B9%B3%E5%88%86%E7%BA%BF%2CDE%E2%8A%A5AB%E4%BA%8E%E7%82%B9E%2CDF%E2%8A%A5BC%E4%BA%8E%E7%82%B9F%2CS%E2%96%B3ABC%3D99c%E3%8E%A1%2CAB%3D18cm%2CBC%3D15cm%2C%E6%B1%82DE%E7%9A%84%E9%95%BF%2C%E6%88%91%E5%B7%B2%E7%BB%8F%E8%AF%81%E6%98%8E%E4%BA%86%E2%88%A01%E2%88%A02%E5%85%A8%E7%AD%89)
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