1,-1／3,1／9,-1／27,1／81······用公式表达此数列,

(8/9+1/3-2/27)×2. 1/2,1/3,1/4,1/8,1/9,1/27,( ),( )有什么规侓? 1,3,3,9,27, lim(2^1/3)*(4^1/9)*(8^1/27)*...*[(2^n)^(1/3^n)]=lim(2^1/3)*(4^1/9)*(8^1/27)*...*[(2^n) 8*(8/3+27/1)+27/19 1/3,-1/9,1/27,-1/81...求数列 23又8/9*3/8除以1/27简算 1-1/3-1/9-1/27-1/81-1/243-1/729-1/2187 判断下列级数的敛散性 （1/2+1/3）+（1/4+1/9）+（1/8+1/27）+...判断下列级数的敛散性（1/2+1/3）+（1/4+1/9）+（1/8+1/27）+... 计算行列式1 1 1 1 2 3 4 5 1 4 9 16 1 8 27 64 1,1/8,1/27,1/64,( ),( ) 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 找规律1/2,3/4,9/8,27/16( ),( ) 27/64,( )/9,3/16,( )/8,1/12 1/2,3/4,8/9,16/27,( ) ( ),