1,1/3,1/3,1/9,1/27,() A.1/243 B.1/255 C.1/162 D.1/164

1,3,3,9,27, 1/3,-1/9,1/27,-1/81...求数列 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 1/3-1/9+1/27+...+(-1)^n-1*1/3^n的极限 1,1-3,1-3+9,1-3+9-27的通项公式, 计算 (1/3)^-2×9^3×27^-1/2 计算 (1/3)^-2×9^3×27^-1/2 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 3/1+9/1+27/1+81/1+243/1+729/1怎么算? 42+1/3+1/9+1/27+1/81+1/243+1/729 1/2,1/3,1/4,1/8,1/9,1/27,( ),( )有什么规侓? (1-1/3 +1/9-1/27 .(-1/3)^2)的数列公式 简便计算243+81+27+9+2+1+1/3+1/9+1/27+1/81+1/243