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这个可以单独分为向量一章，毕竟这在OI中也是一个大类 |
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平面向量线性运算的公式好像写错了 |
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向量旋转那里好像写错了，应该是逆时针旋转 |
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向量这一章为什么没有例题呢 |
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平行向量里面还有一点重要的就是零向量永远都是和其他向量为平行向量 |
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https://oi-wiki.org/math/misc/
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