(明天就要交!)1.求与向量a=(1,2),b=(2,1)夹角相等的单位向量c的坐标.2.已知向量a与b都是非零向量,且(a+3b)⊥(7a-5b),(a-4b)⊥(7a-2b),求向量a与b的夹角.
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![(明天就要交!)1.求与向量a=(1,2),b=(2,1)夹角相等的单位向量c的坐标.2.已知向量a与b都是非零向量,且(a+3b)⊥(7a-5b),(a-4b)⊥(7a-2b),求向量a与b的夹角.](/uploads/image/z/3684788-44-8.jpg?t=%EF%BC%88%E6%98%8E%E5%A4%A9%E5%B0%B1%E8%A6%81%E4%BA%A4%21%EF%BC%891.%E6%B1%82%E4%B8%8E%E5%90%91%E9%87%8Fa%3D%281%2C2%29%2Cb%3D%282%2C1%29%E5%A4%B9%E8%A7%92%E7%9B%B8%E7%AD%89%E7%9A%84%E5%8D%95%E4%BD%8D%E5%90%91%E9%87%8Fc%E7%9A%84%E5%9D%90%E6%A0%87.2.%E5%B7%B2%E7%9F%A5%E5%90%91%E9%87%8Fa%E4%B8%8Eb%E9%83%BD%E6%98%AF%E9%9D%9E%E9%9B%B6%E5%90%91%E9%87%8F%2C%E4%B8%94%28a%2B3b%29%E2%8A%A5%EF%BC%887a-5b%EF%BC%89%2C%28a-4b%29%E2%8A%A5%EF%BC%887a-2b%EF%BC%89%2C%E6%B1%82%E5%90%91%E9%87%8Fa%E4%B8%8Eb%E7%9A%84%E5%A4%B9%E8%A7%92.)
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