找规律:1,3,7,13,21,( ),43.

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找规律:1,3,7,13,21,(),43.找规律:1,3,7,13,21,(),43.找规律:1,3,7,13,21,(),43.两两差分别是2,4,6,8,10,12,14所以21+10=31,同

找规律:1,3,7,13,21,( ),43.
找规律:1,3,7,13,21,( ),43.

找规律:1,3,7,13,21,( ),43.
两两差分别是2,4,6,8,10,12,14
所以21+10=31,同样43-12=31
所以是 31

1,3,7,13,21,(31 ),43。
1+2=3
3+4=7
7+6=13
13+8=21
21+10=31
31+12=43
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31,两数字中间都是2,4,6,8,10,12