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Ta có: \(H=2^{2010}-2^{2009}-2^{2008}-...-2-1\)
\(=2^{2010}-\left(2^{2009}+2^{2008}+...+2+1\right)\)
Đặt \(A=2^{2009}+2^{2008}+...+2+1\)
\(\Rightarrow2A=2^{20010}+2^{2009}+...+2^2+2\)
\(\Rightarrow2A-A=\left(2^{20010}+2^{2009}+...+2^2+2\right)-\left(2^{2009}+2^{2008}+...+2+1\right)\)\(\Rightarrow A=\left(2^{2010}-1\right)+\left(2^{2009}-2^{2009}\right)+\left(2^{2008}-2^{2008}\right)+...+\left(2-2\right)\)\(\Rightarrow A=2001-1\)
\(\Rightarrow H=2^{2010}-\left(2^{2010}-1\right)\)
\(\Rightarrow H=2^{2010}-2^{2010}+1=1\)
Thay \(H=1\) vào biểu thức \(2010^H\)
\(\Rightarrow2010^H=2010^1=1\)
Vậy \(2010^H=1\)
\(H=2^{2010}-2^{2009}-...-2^2-2-1\)
\(2H=2^{2011}-2^{2010}-...-2^3-2^2-2\)
\(2H-H=\left(2^{2011}-2^{2010}-...-2^3-2^2-2\right)-\left(2^{2010}-2^{2009}-...-2^2-2-1\right)\)
\(H=2^{2011}-2^{2010}-2^{2010}-1\)
\(H=2^{2011}-\left(2^{2010}+2^{2010}\right)-1\)
\(H=2^{2011}-2.2^{2010}-1\)
\(H=2^{2011}-2^{2011}-1\)
\(H=-1\)
Suy ra \(2017^H=2017^{-1}=\frac{1}{2017}\)
Vậy \(2017^H=\frac{1}{2017}\)
Chúc bạn học tốt
Đặt \(\frac{a}{b}=\frac{c}{d}=k\Rightarrow a=bk,c=dk\)
Vậy:
\(\frac{a\cdot c}{b\cdot d}=\frac{bk\cdot dk}{b\cdot d}=\frac{k^2\cdot\left[b\cdot d\right]}{b\cdot d}=k^2\)
và
\(\frac{2009a^2+2010c^2}{2009b^2+2010d^2}=\frac{2009\left[bk\right]^2+2010\left[dk\right]^2}{2009b^2+2010d^2}=\frac{2009\cdot b^2k^2+201d^2k^2}{2009b^2+2010d^2}=\frac{k^2\left[2009b^2+2010d^2\right]}{2009b^2+2010d^2}=k^2\)Vậy khi \(\frac{a}{b}=\frac{c}{d}\Rightarrow\frac{ac}{bd}=\frac{2009a^2+2010c^2}{2009b^2+2010d^2}\)
\(2^{225}=\left(2^3\right)^{75}=8^{75}< 9^{75}=\left(3^2\right)^{75}=3^{150}\)
\(2^{2009}+2^{2008}+.......+2+1=b\)
\(\Rightarrow2b=2^{2010}+2^{2009}+.........+2^2+2\)
\(\Rightarrow2b-b=2^{2010}-1\Rightarrow b=2^{2010}-1\)
\(\Rightarrow A=2^{2010}-b=2^{2010}-\left(2^{2010}-1\right)=1\)
\(S=2^{2010}-2^{2009}-....-2-1\)
\(=2^{2010}-\left(2^{2009}+.....+2+1\right)\)
Đặt \(P=1+2+....+2^{2009}\)
\(2P=2+2^2+.....+2^{2010}\)
\(2P-P=\left(2+2^2+....+2^{2010}\right)-\left(1+2+.....+2^{2009}\right)\)
\(P=2^{2010}-1\)
\(\Rightarrow S=2^{2010}-\left(2^{2010}-1\right)=2^{2010}-2^{2010}+1=1\)