In figure 4 ,five points A、B、C、D、E are located on a line. When the

ten distances between pairs are listed from smallest to largest ,the list reads :

2,4,5,7,8,k,13,15,17,19. Then the value of k is         

 


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作业宝As shown in figure point C is on the segment BG and quadrilateral ABCD is a square.AG intersects BD and CD at points E and F,respectively.If AE=5 and EF=3,then FG=
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