Minh Hiếu
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2022-08-02 17:32:03
\(18^{10}:3^{10}=\left(18:3\right)^{10}=6^{10}=60466176\)
2022-08-02 17:31:03
\(3^x+3^{x+1}+3^{x+2}=117\)
\(3^x\left(1+3+3^2\right)=117\)
\(3^x=\dfrac{117}{13}=9=3^2\)
\(\Rightarrow x=2\)
2022-08-02 17:26:50
2022-08-01 15:59:10
\(ĐătA=1+3+3^2+...+3^{1991}\)
\(A=\left(1+3+3^2\right)+3^3\left(1+3+3^2\right)+...+3^{1989}\left(1+3+3^2\right)\)
\(=\left(1+3^3+...+3^{1989}\right)\times13⋮13\)
\(A=\left(1+3^2+3^4+3^6\right)+3\left(1+3^2+3^4+3^6\right)+...+3^{1985}\left(1+3^2+3^4+3^6\right)\)
\(=820\left(1+3+...+3^{1985}\right)\)
\(=20\times41\left(1+3+...+3^{1985}\right)⋮41\)
2022-05-09 21:47:00
\(y\times\left(\dfrac{2}{7}-\dfrac{1}{4}\right)=\dfrac{3}{7}\)
\(y=\dfrac{3}{7}:\dfrac{1}{28}=12\)
2022-05-09 21:30:50
2022-05-09 21:30:00
2022-03-31 21:27:24
2022-03-25 19:32:49
2022-02-24 09:29:37