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观察下列各组数:①9,16,25;②8,15,17;③7,24,25;④12,15,20.其中能作为直角三角形边长的组数为(  )

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(15,2,4,18,16,5,8,24,17,9,13,25)  (2,9,4,25,15,16,13,18,17,5,8,24)  (9,4,16,15,2,13,18,17,5,8,24,25)  (9,16,4,25,2,15,13,18,5,17,8,24)  
(15,2,4,18,16,5,8,24,17,9,13,25)  (2,9,4,25,15,16,13,18,17,5,8,14)  (9,4,16,15,2,13,18,17,5,8,24,15)  (9,16,4,25,2,15,13,18,5,17,8,24)  
(15,2,4,18,16,5,8,24,17,9,13,25)  (9,4,16,15,2,13,18,17,5,8,24,25)  (2,9,4,25,15,16,13,18,17,5,8,24)  (9,16,4,25,2,15,13,18,5,17,8,24)  
3,4,5  5,12,13  8,15,17  12,15,25  
(15,2,4,18,16,5,8,24,17,9,13,25)  (2,9,4,25,15,16,13,18,17,5,8,24)  (9,4,16,15,2,13,18,17,5,8,24,25)  (9,16,4,25,2,15,13,18,5,17,8,24)  
(15,2,4, 18, 16, 5,8,24,17,9,13,25)  (2, 9, 4, 25, 15, 16, 13, 18, 17, 5, 8, 24)  (9, 4, 16, 15, 2, 13, 18, 17, 5, 8, 24, 25)  (9, 16, 4, 25, 2, 15, 13, 18, 5, 17, 8, 24)  
(15,2,4,18,16,5,8,24,17,9,13,25)  (2,9,4,25,15,16,13,18,17,5,8,24)  (9,4,16,15,2,13,18,17,5,8,24,25)  (9,16,4,25,2,15,13,18,5,17,8,24)  
2,3,4  8,15,17  9,16,25  12,15,17  
(15,2,4,18,16,5,8,24,17,9,13,25)  (2,9,4,25,15,16,13,18,17,5,8,24)  (9,4,16,15,2,13,18,17,5,8,24,25)  (9,16,4,25,2,15,13,18,5,17,8,24)  

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