已知向量2a+3b=(-2,4),c=(1,-1),且a*c=3,b的模=4,求向量b和向量c的夹角注意a b c表示的都是向量
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![已知向量2a+3b=(-2,4),c=(1,-1),且a*c=3,b的模=4,求向量b和向量c的夹角注意a b c表示的都是向量](/uploads/image/z/2771443-19-3.jpg?t=%E5%B7%B2%E7%9F%A5%E5%90%91%E9%87%8F2a%2B3b%3D%28-2%2C4%29%2Cc%3D%281%2C-1%29%2C%E4%B8%94a%2Ac%EF%BC%9D3%2Cb%E7%9A%84%E6%A8%A1%EF%BC%9D4%2C%E6%B1%82%E5%90%91%E9%87%8Fb%E5%92%8C%E5%90%91%E9%87%8Fc%E7%9A%84%E5%A4%B9%E8%A7%92%E6%B3%A8%E6%84%8Fa+b+c%E8%A1%A8%E7%A4%BA%E7%9A%84%E9%83%BD%E6%98%AF%E5%90%91%E9%87%8F)
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