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π是無理數,囙此9分之π是無理數,不是分數. 所有的循環小數都可以化為分數,都是有理數. 所有的無限不循環小數都是無理數,都不可以化成分數
∵abcd<0, ∴a,b,c,d中有1個或3個負數, 故答案為:1或3.
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