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解析几何中某些式子的推算繁冗是一个比较棘手的问题.不妨站在系统的高度进行整体思考,避免各个击破,这样有时会求得出轻巧简便的解法.
The computational complexity of some formulas in analytic geometry is a tricky problem. You may wish to think at the height of the system as a whole and avoid breaking, which sometimes results in a light and simple solution.