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第8题
Author:
郭子健
Topic:
Geometry
,
Quadrilaterals
8．如图，点E在正方形ABCD的对角线AC上，EF⊥AB于点F，连接DE并延长，交边BC于点M，交边AB的延长线于点G．若AF=2，FB=1，则MG=（ ）
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