42+1/3+1/9+1/27+1/81+1/243+1/729
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42+1/3+1/9+1/27+1/81+1/243+1/729
42+1/3+1/9+1/27+1/81+1/243+1/729
42+1/3+1/9+1/27+1/81+1/243+1/729
原式=41+(1+1/3+1/9+1/27+1/81+1/243+1/729)
=41+【1-(1/3)六次方】/(1-1/3)=41+(728/729)/(2/3)=41+364/243=42+121/243
一楼算错了
原式=42+(243+81+27+9+3+1)/729=42+364/729
42+1/3+1/9+1/27+1/81+1/243+1/729=42 364/729(不知如何输入,42又729分之364,即30982/729)
42+1/3+1/9+1/27+1/81+1/243+1/729
1+3+9+27+81+243+729
简便计算243+81+27+9+2+1+1/3+1/9+1/27+1/81+1/243
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+1/81+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?
1+3+9+27+81+...+3的N次方
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
巧算:1+3+9++27+81+243+729+2187
求1、3、9、27、81通项公式