浦京棋牌

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      1. Blockchain là gìhọc tiếng Trung onlineyoga Viet Nam

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                  1. Tin tức tiền ảohọc tiếng Trung onlineyoga Viet Nam
                    当前位置: 首页 > 问题分类 > 高中 > 数学 > 问题详情
                    问题

                    如图,在梯形ABCD中,AD∥BC,AC⊥BD,垂足为E,∠ABC=45°,过E作AD的垂线交AD于F,交BC于G,过E作AD的平行线交AB于H.求证:FG2=AF·DF+BG·CG+AH·BH.

                    参考答案
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