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1.æ´æ°åçåæ°ï¼1 - 1/2 = 2/2 - 1/2 =1/2
2.æ´æ°åååæ°ï¼4 - 5/3 = 12/3 - 5/3 = 7/3
3.æ´æ°å带åæ°ï¼7 - 5/2/3ï¼äºåä¸åä¹äºï¼= 7 - ï¼5 + 2/3ï¼= 2 - 2/3 = 6/3 - 2/3 = 4/3
ä¹å¯ä»¥è¿éº¼æ³ï¼7 - 5/2/3 = 21/3 - 17/3 = 4/3
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