-2,-1,2,7,14,() A.23 B.17 C.19 D.25
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-2,-1,2,7,14,() A.23 B.17 C.19 D.25
-2,-1,2,7,14,() A.23 B.17 C.19 D.25
-2,-1,2,7,14,() A.23 B.17 C.19 D.25
A
相邻两个数之间依次相差1 3 5 7 9.
A,-2,-2+1=-1,-1+3=2,2+5=7,7+7=14,14+9=23