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如图,△ABC中,CD⊥AB于D,由下列条件中的某一个就能推出△ABC是直角三角...
如图,△ABC中,CD⊥AB于D,由下列条件中的某一个就能推出△ABC是直角三角形的是
.(把所有正确答案的序号都填写在横线上)
①∠ACD=∠B;②∠A:∠B:∠C=4:3:5;③AC•BC=AB•CD;④
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.
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