2,5,11,20,32,( );1,4,3,8,5,16,7,32,( ),( )找规律
问题描述：
2,5,11,20,32,( );1,4,3,8,5,16,7,32,( ),( )找规律
答
2,5,11,20,32,(47)
可以看到前面的,2+3=5,5+6=11,11+9=20,20+12=32
后一项减前一项的差是等差数列,公差为3
12+3=15
所以下一项是32+15=47
1,4,3,8,5,16,7,32,(9 ),(34 )