2/3+2/9+2/27+2/81
2/3+2/9+2/27+2/81
数学1-2/3-2/9-2/27-2/81-2/243-2/729 简算
1-2/3-2/9-2/27-2/81-2/243-2/729=?求简算
2/3+2/9+2/27+2/81+……+2/2187=_______
2/3+2/9+2/27+2/81…+2/243
2/3+2/9+27/2+81/2+243/2等于多少
2/3+2/9+2/27+2/81+2/243计算规律是啥?
9^1/6除以81^-1/4*(-27)^2/3
27^25/9^7*81^2 简算
1/56+1/72+1/90+1/110 2/3+2/9+2/27+2/81+2/243+2/729
2/3+2/9+2/27+2/81+2/243 9.6+99.6+999.6+9999.6+99999.6 2/1-1/
简便计算243+81+27+9+2+1+1/3+1/9+1/27+1/81+1/243