2,6,12,20,30,42( )找规律答:1*2=2 2*3=6 3*4=12 4*5=20 5*6=30 6*7=42 7*8=56 2,6,12,20,30,42( 56)
找规律填数2.6.12.36.72的后面是多少答:2、解释:2,10,4,9,6,8数列,奇数列是按2,4,6,8,10公差为2 等差数列,偶数列是安照10,9,8,7,6公差为-1的等差数列,按此规律可得,气候资料依次为8,7,10,6,12,5,14,4,16,3,18,2,20,1,22,0 一年级找规律填数字1815129后面是多少 a(1)=21-3×1=18; a(2...
2,3,4,6,6,9,8,12,10,— ,— ,— .找规律答:2,3,4,6,6,9,8,12,10,(15),(12),(18)跳着看2+2=4 4+2=6 6+2=8 .3+3=6 6+3=9 9+3=12.