1,7,23,55,109,191差6,16,32,54,82再差10,16,22,283级差 6,6,6下面一趟都是上面一趟的后项减前项,所以再从最下面填6,如下:6,6,6 ,610,16,22,28,346,16,32,54,82,1161,7,23,55,109,191,307最后的307就是所求...
