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自全国推广新课程以来,立体几何试题一般都可从两条思路出发去求解.一条是几何法,另一条是向量法.但无论是用几何法还是用向量法,都突出了平面化的思想.计算一
Since the promotion of the new curriculum across the country, three-dimensional geometry questions can generally be solved from two perspectives. One is a geometric method and the other is a vector method. However, both the geometric method and the vector method highlight the idea of planarization. . Calculate one