6,9,13,16,21,( ) A 25 B 26 C 27 D 286,9,13,16,21,( ) A 25 B 26 C 27 D 28
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6,9,13,16,21,( ) A 25 B 26 C 27 D 286,9,13,16,21,( ) A 25 B 26 C 27 D 28
6,9,13,16,21,( ) A 25 B 26 C 27 D 28
6,9,13,16,21,( )
A 25 B 26 C 27 D 28
6,9,13,16,21,( ) A 25 B 26 C 27 D 286,9,13,16,21,( ) A 25 B 26 C 27 D 28
质数列:2 3 5 7 11 13
合数列:4 6 8 9 10 12
相加得
新数列:6 9 13 16 21 25
这个好难想啊,一楼的正解。