1/3+1/9+1/27=?1/3+1/9+1/27+1/81=?1/3+1/9+1/27+1/81+1/243=?1/3+1/9+1/27+1/81+1/243+1/729=?蟹蟹=w=

1,3,3,9,27, 1-1/3-1/9-1/27-1/81-1/243-1/729=? 解方程：X*1/3*4/9=1/27 1/3,-1/9,1/27,-1/81...求数列 1/3+1/9+1/27+1/81+1/243=?(要简便计算） 1-1/3+1/9-1/27+1/81-1/243+1/729-1/2187+...=? 拜托各位 1/3+1/9+/1/27+...+1/3^7=?求结果 1/3+1/9+1/27=?1/3+1/9+1/27+1/81=?1/3+1/9+1/27+1/81+1/243=?1/3+1/9+1/27+1/81+1/243+1/729=?蟹蟹=w= 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) 1-1/3-1/9-1/27-1/81-1/243-1/729-1/2187 (x+1)^3=-27 计算：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