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...
数字推理2,6,12,4,(),24,8答:2,6,12,4,(12),24,8 -2*[2+(-6)]=8 -2*[-6+8]=-4 -2*[8+(-4)]=8 -2*[-4+(-8)]=24 通项公式:An+2=-2*(An+An+1)