正、余弦定理的几道题目...我有点笨…- 不要直接给答案,1.△ABC中,A、B、C所对的边分别为a、b、c,a=x,b=2,B=45°,若该△有2解,求x取值范围2.tanA=2,tanB=3,a=1,角C=45°,求三角形面积3.三角形ABC中,三边长
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![正、余弦定理的几道题目...我有点笨…- 不要直接给答案,1.△ABC中,A、B、C所对的边分别为a、b、c,a=x,b=2,B=45°,若该△有2解,求x取值范围2.tanA=2,tanB=3,a=1,角C=45°,求三角形面积3.三角形ABC中,三边长](/uploads/image/z/6881248-64-8.jpg?t=%E6%AD%A3%E3%80%81%E4%BD%99%E5%BC%A6%E5%AE%9A%E7%90%86%E7%9A%84%E5%87%A0%E9%81%93%E9%A2%98%E7%9B%AE...%E6%88%91%E6%9C%89%E7%82%B9%E7%AC%A8%E2%80%A6-+%E4%B8%8D%E8%A6%81%E7%9B%B4%E6%8E%A5%E7%BB%99%E7%AD%94%E6%A1%88%2C1.%E2%96%B3ABC%E4%B8%AD%2CA%E3%80%81B%E3%80%81C%E6%89%80%E5%AF%B9%E7%9A%84%E8%BE%B9%E5%88%86%E5%88%AB%E4%B8%BAa%E3%80%81b%E3%80%81c%2Ca%3Dx%2Cb%3D2%2CB%3D45%C2%B0%2C%E8%8B%A5%E8%AF%A5%E2%96%B3%E6%9C%892%E8%A7%A3%2C%E6%B1%82x%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B42.tanA%3D2%2CtanB%3D3%2Ca%3D1%2C%E8%A7%92C%3D45%C2%B0%2C%E6%B1%82%E4%B8%89%E8%A7%92%E5%BD%A2%E9%9D%A2%E7%A7%AF3.%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2C%E4%B8%89%E8%BE%B9%E9%95%BF)
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