1/3+1/9+1/27+1/81+1/243+1/729求简便~~~~~~~~~~~~~~~
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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求简便~~~~~~~~~~~~~~~1/3+1/
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
求简便~~~~~~~~~~~~~~~
1/3+1/9+1/27+1/81+1/243+1/729求简便~~~~~~~~~~~~~~~
用等比数列,公比是1/3,这是前六项的和故总和=1/3{1-(1/3)^6}/(1-1/3)即可
是等比数列求和的题目
首项是1/3,公比是1/3的等比数列
用求和公式就可以了
等比数列求和
首项是1/3,公比是1/3,项数是6
1/3+1/9+1/27+1/81+1/243+1/729
=(1/3)*[1-(1/3)^6]/(1-1/3)
=(1-1/3^6)/2
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)