按规律填空:1.3,4,6,9,9,16,12,().15.36( )
问题描述:
按规律填空:1.3,4,6,9,9,16,12,().15.36( )
答
25
答
25 和 18
答
1.3,4,6,9,9,16,12,(25).15.36( 18)
奇数项:1+3=4+5=9+7=16+9=25+11=36
偶数项:
3×1=3
3×2=6
3×3=9
3×4=12
3×5=15
3×6=18
答
1.3,4,6,9,9,16,12,(25).15.36( 18 )