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3-(-5)-(-7)-(-9)¥i¥H¶Ü
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À³¸Ó¬O³o¼Ë§a¡I9*(5-7/3)§Ú¤]¨Ó¤@ÃD¡G2,8,9,13¡A¦ý¥u¯à¥Î+¡A-¡A/¤Î¬A¸¹¡A§Y¤£¯à¥Î * ¸¹¡C
9/(2-13/8)
(10+1)*3-9
(2+4/10)10
3 3 7 7
(3+3/7)*7=24