最好做在一张纸上,用照片的方式发过来,设△ABC的三内角A、B、C所对边的边长分别为a、b、c,平面向量m=(cosA,cosC),向量n=(c,a),向量p=(2b,0),且向量m(向量n-向量p)=0(1)求角A的大小(2)当|x|≤A时,
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![最好做在一张纸上,用照片的方式发过来,设△ABC的三内角A、B、C所对边的边长分别为a、b、c,平面向量m=(cosA,cosC),向量n=(c,a),向量p=(2b,0),且向量m(向量n-向量p)=0(1)求角A的大小(2)当|x|≤A时,](/uploads/image/z/7114513-49-3.jpg?t=%E6%9C%80%E5%A5%BD%E5%81%9A%E5%9C%A8%E4%B8%80%E5%BC%A0%E7%BA%B8%E4%B8%8A%2C%E7%94%A8%E7%85%A7%E7%89%87%E7%9A%84%E6%96%B9%E5%BC%8F%E5%8F%91%E8%BF%87%E6%9D%A5%2C%E8%AE%BE%E2%96%B3ABC%E7%9A%84%E4%B8%89%E5%86%85%E8%A7%92A%E3%80%81B%E3%80%81C%E6%89%80%E5%AF%B9%E8%BE%B9%E7%9A%84%E8%BE%B9%E9%95%BF%E5%88%86%E5%88%AB%E4%B8%BAa%E3%80%81b%E3%80%81c%2C%E5%B9%B3%E9%9D%A2%E5%90%91%E9%87%8Fm%3D%28cosA%2CcosC%29%2C%E5%90%91%E9%87%8Fn%3D%28c%2Ca%29%2C%E5%90%91%E9%87%8Fp%3D%282b%2C0%29%2C%E4%B8%94%E5%90%91%E9%87%8Fm%EF%BC%88%E5%90%91%E9%87%8Fn-%E5%90%91%E9%87%8Fp%EF%BC%89%3D0%281%29%E6%B1%82%E8%A7%92A%E7%9A%84%E5%A4%A7%E5%B0%8F%EF%BC%882%EF%BC%89%E5%BD%93%7Cx%7C%E2%89%A4A%E6%97%B6%2C)
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