1.1+1.91+1.991+1.9991+...+1.9999999991怎么简算
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1.1+1.91+1.991+1.9991+...+1.9999999991怎么简算1.1+1.91+1.991+1.9991+...+1.9999999991怎么简算1.1+1.91+1.991+1
1.1+1.91+1.991+1.9991+...+1.9999999991怎么简算
1.1+1.91+1.991+1.9991+...+1.9999999991怎么简算
1.1+1.91+1.991+1.9991+...+1.9999999991怎么简算
=(2-0.9)+(2-0.09)+(2-0.009)+(2-0.0009)+……+ (2-0.0000000009)
=20-0.9999999999
=19.0000000001
1.1＋1.91＋1.991＋1.9991＋.+1.999...991(9个9)
计算：1.1＋1.91＋1.991＋……＋1.999……991（100个9）.
1.1+1.91+1.991+1.9991+...+1.9999999991怎么简算
1.1+1.91+1.991+.+1.99.9991.99.9991是100个9
1.1+1.91+1.991+.+1.99(100个九)121:20之前要!要算术法！
1.1+1.91+1.991+.+1.{99.9}1 { }处为100个9
1+1.91+1.991+ …+1.9999991等于多少?
1.1+1.91+1.991+1.9991+……+1.99999……991（100个9）=?怎么算```好麻烦`大家帮帮忙咯`
1+1.91+1.991+...+1.99...991(100个9)的答案
1.1+1.91+1.991+1.99999……(100个九)1=多少这是一道数奥题,A.20.100……(100个0)1B.201.1000……（100个0）1C.2010.100000……（100个0）1
简算 5.97-3.81+1.91
1999+199.9+19.99+1.999 简算
1999+199.9+19.99+1.999+0.1999
1999+199.9+19.99+1.999=?
1999+199.9+19.99+1.999+0.1999
巧算 1.999+19.99+199.9+1999
1.999精确到0.01是多少
1.999精确到0.01是多少