-3,9,-27,81,-243,729,...
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-3,9,-27,81,-243,729,...
-3,9,-27,81,-243,729,...
-3,9,-27,81,-243,729,...
后面的数是前面的数的(-3)倍.
什么意思?
(-3)^n
规律是-3的N次方
(1)②+3=① ,③乘以3=①
(2)-3^2011
(3)188968
1+3+9+27+81+243+729
-3,9,-27,81,-243,729,...
巧算:1+3+9++27+81+243+729+2187
-3,9,-27,81,-243,729,...有什么规律
1/3+1/9+1/27+1/81+1/243+1/729求简便~~~~~~~~~~~~~~~
1/3+1/9+1/27+1/81+1/243+1/729怎简便
计算:1+1/3+1/9+1/27+1/81+1/243+1/729
1-1/3-1/9-1/27-1/81-1/243-1/729=?
3/1+9/1+27/1+81/1+243/1+729/1怎么算?
求1+1/3+1/9+1/27+1/81+...+1/243+1/729
1-2/3-2/9-2/27-2/81-2/243-2/729=
计算:1-1/3-1/9-1/27-1/81-1/243-1/729
数学1-2/3-2/9-2/27-2/81-2/243-2/729 简算
42+1/3+1/9+1/27+1/81+1/243+1/729
1-1/3-1/9-1/27-1/81-1/243-1/729-1/2187
用错位相减法算 (1)3+9+27+81+243+729+2187的和
1-2/3-2/9-2/27-2/81-2/243-2/729=?求简算
3,9,27,81,243,729这组数有什么规律我介都快没脑汁了。