(1) (6) (16) ( ) (51) ( 76) 找规律（1) (6) (16) ( ) (51) ( 76) （ ) ( ) (21) ( ) (35) ( )(8) (15) (10) (13) (12) (11) ( ) ( )

(1) (6) (16) ( ) (51) ( 76) 找规律（1) (6) (16) ( ) (51) ( 76) （ ) ( ) (21) ( ) (35) ( )(8) (15) (10) (13) (12) (11) ( ) ( )
(1) (6) (16) ( ) (51) ( 76) 找规律
（1) (6) (16) ( ) (51) ( 76)
（ ) ( ) (21) ( ) (35) ( )
(8) (15) (10) (13) (12) (11) ( ) ( )

(1) (6) (16) ( ) (51) ( 76) 找规律（1) (6) (16) ( ) (51) ( 76) （ ) ( ) (21) ( ) (35) ( )(8) (15) (10) (13) (12) (11) ( ) ( )
(1) (6) (16) (31 ) (51) ( 76)
1+5=6
6+10=16
16+15=31
31+20=51
51+25=76
（7 ) (14 ) (21) (28 ) (35) ( 42)
1*7=7
2*7=14
3*7=21
4*7=28
5*7=35
6*7=42
(8) (15) (10) (13) (12) (11) (14 ) (9 )
奇数项：
8+2=10
10+2=12
12+2=14
14+2=16
偶数项：
15-2=13
13-2=11
11-2=9
9-2=7,