help help

来源：学生作业帮助网编辑：作业帮时间：2024/06/03 05:37:20

help help
help help

help help
证△COA≌△DOB,推出等腰直角三角形AOB,求出AB=根号2
OA,得出要使AB最小,只要OA取最小值即可,当OA⊥CD时,OA最小,求出OA的值即可．

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