用向量证明余弦定理教科书上a^2=b^2+c^2-2b×c×cosA.就是说a=b-c或a=c-b咯.可是并不是这样阿.
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![用向量证明余弦定理教科书上a^2=b^2+c^2-2b×c×cosA.就是说a=b-c或a=c-b咯.可是并不是这样阿.](/uploads/image/z/3715514-26-4.jpg?t=%E7%94%A8%E5%90%91%E9%87%8F%E8%AF%81%E6%98%8E%E4%BD%99%E5%BC%A6%E5%AE%9A%E7%90%86%E6%95%99%E7%A7%91%E4%B9%A6%E4%B8%8Aa%5E2%EF%BC%9Db%5E2%EF%BC%8Bc%5E2%EF%BC%8D2b%C3%97c%C3%97cosA.%E5%B0%B1%E6%98%AF%E8%AF%B4a%EF%BC%9Db%EF%BC%8Dc%E6%88%96a%EF%BC%9Dc%EF%BC%8Db%E5%92%AF.%E5%8F%AF%E6%98%AF%E5%B9%B6%E4%B8%8D%E6%98%AF%E8%BF%99%E6%A0%B7%E9%98%BF.)
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