Nguyễn Xuân Thành
Giới thiệu về bản thân
Sadness flies away on the wings of time. ☺☘
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2023-09-28 14:54:18
\(A=1+3+3^2+3^3+...+3^{99}+3^{100}\)
Ta có: \(3A=3+3^2+3^3+...+3^{99}+3^{100}\)
Khi đó: \(3A-A=3+3^2+3^3+...+3^{99}+3^{100}+3^{101}-\left(1+3+3^2+3^3+...+3^{99}+3^{100}\right)\)
\(=3^{101}-1\)
\(\Leftrightarrow2A=3^{101}-1\)
Vậy \(A=\left(3^{101}-1\right):2\)
2023-09-28 14:02:09
hay quá ạ
2023-09-28 13:38:17
2023-09-28 12:20:03
2023-09-28 10:56:56
Ngôi trường có rất nhiều cây xanh
2023-09-28 10:54:39
\(11^n=1331\)
\(\Rightarrow11^3=1331\)
\(\Rightarrow n=3\)
Vậy \(n=3\)
2023-09-27 22:06:15
2023-09-27 21:24:10
\(2^x=2^5\)
\(\Rightarrow2^x=32\)
\(\Rightarrow2^5=32\)
\(\Rightarrow x=5\)
2023-09-27 21:21:08
Bút chì.
2023-09-27 21:18:41
\(10000=\overline{X}\)