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若a﹣b=1,ab=﹣2,则(a+1)(b﹣1)=   .

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=AVERAGE(A1: B1), =AVERAGE(3, "8")  =COUNT(A1: B1), =COUNT(3, "8")  =MAX(A1: B1) =MAX(3, "8")  =MIN(A1: B1) =MIN(3, "8")  
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