1-1/3-1/9-1/27-1/81-1/243-1/729-1/2187
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1-1/3-1/9-1/27-1/81-1/243-1/729-1/21871-1/3-1/9-1/27-1/81-1/243-1/729-1/21871-1/3-1/9-1/27-1/81-1/24
1-1/3-1/9-1/27-1/81-1/243-1/729-1/2187
1-1/3-1/9-1/27-1/81-1/243-1/729-1/2187
1-1/3-1/9-1/27-1/81-1/243-1/729-1/2187
1-1/3-1/9-1/27-1/81-1/243-1/729-1/2187
=1-(1/3+1/9+1/27+1/81+1/243+1/729+1/2187)
=1-(1/3)*[1-(1/3)^7]/[1-(1/3)]
=1-(1/3)*[1-(1/2187)]/(2/3)
=1-(1/2)*(2186/2187)
=1094/2187
1+3+9+27+81+243+729
1-1/3-1/9-1/27-1/81-1/243-1/729-1/2187
简便计算243+81+27+9+2+1+1/3+1/9+1/27+1/81+1/243
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+1/81+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
3分之1-9分之1+27分之1+81分之1+243分之1】
1/3+1/9+1/27+1/81+1/243=?(要简便计算）
1/3+1/9+1/27+1/81+……+1/177147
1／3,-1／9,1／27,-1／81,1／243...通项公式是什么
1-1/3+1/9-1/27+1/81-1/243+1/729-1/2187+...=? 拜托各位
1+3+9+27+81+...+3的N次方
1/3+1/9+1/27+1/81+……≈（接近哪个数）