几道八下5道数学证明题(过程不是很复杂的那种)!1.在△ABC中,AB=AC,AB的垂直平分线与AC所在的直线相交所得的锐角为50°,求∠A的度数(有两个答案,一个40°一个140°,2.已知a、b、c是△ABC的三边
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![几道八下5道数学证明题(过程不是很复杂的那种)!1.在△ABC中,AB=AC,AB的垂直平分线与AC所在的直线相交所得的锐角为50°,求∠A的度数(有两个答案,一个40°一个140°,2.已知a、b、c是△ABC的三边](/uploads/image/z/1708972-52-2.jpg?t=%E5%87%A0%E9%81%93%E5%85%AB%E4%B8%8B5%E9%81%93%E6%95%B0%E5%AD%A6%E8%AF%81%E6%98%8E%E9%A2%98%EF%BC%88%E8%BF%87%E7%A8%8B%E4%B8%8D%E6%98%AF%E5%BE%88%E5%A4%8D%E6%9D%82%E7%9A%84%E9%82%A3%E7%A7%8D%EF%BC%89%211.%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2CAB%3DAC%2CAB%E7%9A%84%E5%9E%82%E7%9B%B4%E5%B9%B3%E5%88%86%E7%BA%BF%E4%B8%8EAC%E6%89%80%E5%9C%A8%E7%9A%84%E7%9B%B4%E7%BA%BF%E7%9B%B8%E4%BA%A4%E6%89%80%E5%BE%97%E7%9A%84%E9%94%90%E8%A7%92%E4%B8%BA50%C2%B0%2C%E6%B1%82%E2%88%A0A%E7%9A%84%E5%BA%A6%E6%95%B0%EF%BC%88%E6%9C%89%E4%B8%A4%E4%B8%AA%E7%AD%94%E6%A1%88%2C%E4%B8%80%E4%B8%AA40%C2%B0%E4%B8%80%E4%B8%AA140%C2%B0%2C2.%E5%B7%B2%E7%9F%A5a%E3%80%81b%E3%80%81c%E6%98%AF%E2%96%B3ABC%E7%9A%84%E4%B8%89%E8%BE%B9)
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