A QUESTION ABOUT MATHS 有一直立标杆,它的上部被风从B处吹折,杆顶C着地,离杆脚2米.修好后有被风吹折,因新断处比前一次低0.5米,故杆顶着地处E比C远一米.求原标杆的高.道理清楚写!

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