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0<60 - 0<60-く <30 b 30<- <60.

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0 < 60-a/b < 30

各辺から 60 を引いて
-60 < -a/b < -30

各辺に -1 をかけて (不等号の向きが入れ替わる)
60 > a/b > 30

よって、 30 < a/b < 60

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