最好有图.1.在△ABC中,∠B=2∠C,AD是∠BAC的平分线.求证:AC=AB+BD.2.在△ABC中,AD是BC的中线,试说明:AB+AC﹥2AD.
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![最好有图.1.在△ABC中,∠B=2∠C,AD是∠BAC的平分线.求证:AC=AB+BD.2.在△ABC中,AD是BC的中线,试说明:AB+AC﹥2AD.](/uploads/image/z/11620731-3-1.jpg?t=%E6%9C%80%E5%A5%BD%E6%9C%89%E5%9B%BE.1.%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2C%E2%88%A0B%3D2%E2%88%A0C%2CAD%E6%98%AF%E2%88%A0BAC%E7%9A%84%E5%B9%B3%E5%88%86%E7%BA%BF.%E6%B1%82%E8%AF%81%EF%BC%9AAC%3DAB%2BBD.2.%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2CAD%E6%98%AFBC%E7%9A%84%E4%B8%AD%E7%BA%BF%2C%E8%AF%95%E8%AF%B4%E6%98%8E%EF%BC%9AAB%2BAC%EF%B9%A52AD.)
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