1,4,7,10,( ),16 5,6,8,12,20,( )1,2,5,10,17,( )
问题描述:
1,4,7,10,( ),16
5,6,8,12,20,( )
1,2,5,10,17,( )
答
13 1+3=4,4+3=7,7+3=10,10+3=13,13+3=16
36 5+1=6,6+1*2=8,8+1*2*2=12,12+2*2*2=20,20+2*2*2*2=36
26 1=0的平方加1,2=1的平方加1,5=2的平方加1,10=3的平方加1,17=4的平方加1,26=5的平方加1
答
1,4,7,10,(13 ),16 (等差数列,公差为3)
5,6,8,12,20,(36 ) (后一项比前一项差1,2,4,8,16……差比数列)
1,2,5,10,17,(26 )(后一项比前一项差1,3,5,7……二次等差数列)
答
1,4,7,10,(13 ),16 (规律:每个加3得后一个数)
5,6,8,12,20,(36 ) (规律:加1 2 4 8 16 )
1,2,5,10,17,(26 )(规律:加1 3 5 7 9)
答
13
36
28