243,81,27,( ),( )
1+3+9+27+81+243+729
找规律填空 243,81,27,( ),( )
3,9,27,81,243,729.有什么规律
巧算:1+3+9++27+81+243+729+2187
3,9,27,81,243,第n个数字是多少
3,9,27,81,243,729这组数有什么规律
-3,9,-27,81,-243,729,...有什么规律
找规律填数 243 81 27 9 ( )
找规律,5,243,10,81,20,27__,__,
①负3,负27,81,负243……
简便计算243+81+27+9+2+1+1/3+1/9+1/27+1/81+1/243
3,9,27,81,243,729,… 1,7,25,79,241,727,… 1,3,9,27,81,243,… 2.