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一、定理:已知:如图1,如果AB=AC,EB=EC, 那么AF左边图形与右边图形关于直线AF对时称。证明:在△ABE和△ACE中,
1. Theorem: Known: As shown in Fig. 1, if AB=AC and EB=EC, then AF left-hand figure and right-hand figure are called relative to straight line AF. Proof: In △ABE and △ACE,