求11,15,18,20,21,20,19 ,数列解,并请告知解法,
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求11,15,18,20,21,20,19,数列解,并请告知解法,求11,15,18,20,21,20,19,数列解,并请告知解法,求11,15,18,20,21,20,19,数列解,并请告知解法,1
求11,15,18,20,21,20,19 ,数列解,并请告知解法,
求11,15,18,20,21,20,19 ,数列解,并请告知解法,
求11,15,18,20,21,20,19 ,数列解,并请告知解法,
11+4=15
15+3=18
18+2=20
20+1=21
21-1=20
20-1=19
19-1=18