作业帮1,1/3,1/9,1/27,1/18,( )A.1/243 B.1/255 C.1/162 D.1/164
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1,1/3,1/9,1/27,1/18,( )A.1/243 B.1/255 C.1/162 D.1/164
1,1/3,1/9,1/27,1/18,( )
A.1/243 B.1/255 C.1/162 D.1/164
1,1/3,1/9,1/27,1/18,( )A.1/243 B.1/255 C.1/162 D.1/164
题目修改一下1,1/3,1/9,1/27,1/81 A 1=（1/3）^0,1/3=(1/3)^1 1/9=(1/3)^2 …… 1,1/3,1/9,1/27,1/81,(1/243 )
1+9+18+27=?
1/27/（1/9+1/18）简便算法
9+1-18+27-17-1+17+18=?
1,3,3,9,27,
12,9,21,27,15,60,3,1,18
1`9`2`18`3`27`( )`( )`( )这题怎么做
1 ,3,1 ,4 ,9,1 ,8,( ) A 18 B 27 C 36 D12
1/3,-1/9,1/27,-1/81...求数列
1,1/3,1/9,1/27,1/18,( )A.1/243 B.1/255 C.1/162 D.1/164
1-1/3-1/9-1/27-1/81-1/243-1/729-1/2187
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=?
求1+1/3+1/9+1/27+1/81+...+1/243+1/729
计算：1-1/3-1/9-1/27-1/81-1/243-1/729
给帮忙算个四阶行列式1 1 1 1 2 -2 3 -14 4 9 18 -8 27 -1..
数字推理 1 1/3 1/9 1/27 1/18 (1/243) 这个1/243是怎么推算出来的?
1/3-1/9+1/27+...+(-1)^n-1*1/3^n的极限
1/3+1/9+1/27+1/81+1/243+1/729求简便~~~~~~~~~~~~~~~