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中线长定理在初中几何中很少触及,但运用它来解决某些问题,常有奇效.本刊在2002年第3期载有《用中线长定理解题》,下面首先给出证明.
The midline long theorem is rarely touched in junior high school geometry, but it is often used to solve some problems. There are often significant effects in this paper. This issue was published in the third issue of 2002 with the “Changing Midline Longitudinal Questions”.