Summer Clouds moderators
11/10/2017 at 14:52-
Huỳnh Anh Phương 11/02/2019 at 09:01\(A=\overline{6000...000}+\overline{6000...00}\times2+...+60\times\left(x-1\right)+6\times x\)
\(A=\overline{6000...000}+\overline{6000...00}\times2+...+60\times\left(x-1\right)+6\times x\)