格式题(要有详细的解题过程,要体现明确的解题思路):1.△ABC中,AB=AC,BD是AC边上的中线,BD把△ABC的周长分为两部分之差是4cm,BC=7cm,求腰长AB的值.2.等边三角形ABC中,BD平分角ABC,CE平分角ACB,BD、CE交
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![格式题(要有详细的解题过程,要体现明确的解题思路):1.△ABC中,AB=AC,BD是AC边上的中线,BD把△ABC的周长分为两部分之差是4cm,BC=7cm,求腰长AB的值.2.等边三角形ABC中,BD平分角ABC,CE平分角ACB,BD、CE交](/uploads/image/z/2995183-55-3.jpg?t=%E6%A0%BC%E5%BC%8F%E9%A2%98%28%E8%A6%81%E6%9C%89%E8%AF%A6%E7%BB%86%E7%9A%84%E8%A7%A3%E9%A2%98%E8%BF%87%E7%A8%8B%2C%E8%A6%81%E4%BD%93%E7%8E%B0%E6%98%8E%E7%A1%AE%E7%9A%84%E8%A7%A3%E9%A2%98%E6%80%9D%E8%B7%AF%29%3A1.%E2%96%B3ABC%E4%B8%AD%2CAB%3DAC%2CBD%E6%98%AFAC%E8%BE%B9%E4%B8%8A%E7%9A%84%E4%B8%AD%E7%BA%BF%2CBD%E6%8A%8A%E2%96%B3ABC%E7%9A%84%E5%91%A8%E9%95%BF%E5%88%86%E4%B8%BA%E4%B8%A4%E9%83%A8%E5%88%86%E4%B9%8B%E5%B7%AE%E6%98%AF4cm%2CBC%3D7cm%2C%E6%B1%82%E8%85%B0%E9%95%BFAB%E7%9A%84%E5%80%BC.2.%E7%AD%89%E8%BE%B9%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2CBD%E5%B9%B3%E5%88%86%E8%A7%92ABC%2CCE%E5%B9%B3%E5%88%86%E8%A7%92ACB%2CBD%E3%80%81CE%E4%BA%A4)
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