回复：algebra 2 question!!

来源: jinjing 于 2010-05-24 08:22:39 [] [旧帖] [给我悄悄话] 阅读数 : (136 bytes)

28=2*2*7,If b=2m-1,or b=7n-1,the fraction can be simplified.Since (b,b+1)=1,if b is not 2m-1,or 7n-1,the fraction can not be simplified.

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