280.270.140.90.70.30()()找规律,

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280.270.140.90.70.30()()找规律,

280.270.140.90.70.30()()找规律,
280.270.140.90.70.30()()找规律,

280.270.140.90.70.30()()找规律,
(35) (30) 280是140的2倍 140是70的2倍 70除以2=35 270是90的3倍 90是30的3倍 30除以3=10