1-2/3-2/9-2/27-2/81-2/243-2/729=
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1-2/3-2/9-2/27-2/81-2/243-2/729=1-2/3-2/9-2/27-2/81-2/243-2/729=1-2/3-2/9-2/27-2/81-2/243-2/729=1-2/
1-2/3-2/9-2/27-2/81-2/243-2/729=
1-2/3-2/9-2/27-2/81-2/243-2/729=
1-2/3-2/9-2/27-2/81-2/243-2/729=
1-2/3-2/9-2/27-2/81-2/243-2/729
=1-2/3-2/9-2/27-2/81-2/243-2/729-1/729+1/729
=1-2/3-2/9-2/27-2/81-2/243-3/729+1/729
=1-2/3-2/9-2/27-2/81-2/243-1/243+1/729
=1-2/3-2/9-2/27-2/81-1/81+1/729
=1-2/3-2/9-2/27-1/27+1/729
=1-2/3-2/9-1/9+1/729
=1-2/3-1/3+1/729
=1-1+1/729
=1/729
1－486/729-162/729-54/729-18/729-6/729-2/729可得到：
1－（486/729+162/729+54/729+18/729+6/729+2/729）＝1-728/729＝1/729
2/3+2/9+2/27+2/81+2/243
1-2/3-2/9-2/27-2/81-2/243-2/729=
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
简便计算243+81+27+9+2+1+1/3+1/9+1/27+1/81+1/243
1/56+1/72+1/90+1/110 2/3+2/9+2/27+2/81+2/243+2/729两道题是分开的。打错了。应该是2/3+2/9+2/27+2/81+2/243+2/729
3*9*81*3的2n 1次方=3的5n-2/27
巧算【789+789789+789789789】/【987+987987+987987987】1-2/3-2/9-2/27-2/81-2/243
1/2,3/4,8/9,( ),81/32,( ),( ) 27/64,9/16,3/4,( ),( ) 找规律
2/3+2/9+2/27+2/81+2/243做下这题,要求简便运算,脱式
2/3+2/9+2/27+2/81+2/243,用借数还原法来做.
2/3+2/9+2/27+2/81…+2/243
2/3+2/9+2/27+2/81+2/243=?简便运算
2/3+2/9+2/27+2/81+2/243计算规律是啥?
3分之2+9分之2+27分之2+81分之2+243分之2
2/3+2/9+2/27+2/81+2/243=
****5**2* 27***81** 8***6*9** 13 *9***5*** 5****3*** *1**7*68*