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Đặt A = 22009 + 22008 + ... + 21 + 20. Khi đó, M = 22010 - A
Ta có 2A = 22010 + 22009 + ... + 22 + 21.
Suy ra 2A - A = 22010 - 20 = 22010 - 1.
Do đó M = 22010 - A = 22010 - (22010 - 1) = 22010 - 22010 + 1 = = 1.
M=2^2010-(2^2009+2^2008+2^2007+...+2^1+2^0)
M=22010-22009-22008-22007-...-21-20
=>2M=22011-22010-22009-22008-...-22-21
=>2M-M=22011-22010-22009-22008-...-22-21-(22010-22009-22008-22007-...-21-20)
=>M=22011-22010-22009-22008-...-22-21-22010+22009+22008+22007+...+21+20
=22011-22010-22010+20
=22011-2.22010+1
=22011-22011+1
=1
vậy M=1
A=2(1+2)+2^3(1+2)+...+2^2009(1+2)
=3(2+2^3+...+2^2009) chia hết cho 3
A=2(1+2+2^2)+2^4(1+2+2^2)+...+2^2008(1+2+2^2)
=7(2+2^4+...+2^2008) chia hết cho 7
\(\frac{a+b-c}{c}=\frac{b+c-a}{a}=\frac{c+a-c}{b}\Rightarrow2+\frac{a+b-c}{c}=2+\frac{b+c-a}{a}=2+\frac{c+a-c}{b}\)
\(\Leftrightarrow\frac{a+b+c}{a}=\frac{a+b+c}{b}=\frac{a+b+c}{c}\left(ĐK:a,b,c\ne0\right)\)
\(TH1:a+b+c\ne0\)
\(\Rightarrow a=b=c\)
\(\Rightarrow M=\left(\frac{a}{b}+1\right).\left(\frac{b}{c}+1\right).\left(\frac{c}{a}+1\right)=\left(\frac{a}{a}+1\right).\left(\frac{b}{b}+1\right).\left(\frac{c}{c}+1\right)=2^3=8\)
\(TH2:a+b+c=0\)
\(\Rightarrow\hept{\begin{cases}a=-\left(b+c\right)\\b=-\left(a+c\right)\\c=-\left(a+b\right)\end{cases}}\)
\(\Rightarrow M=\left(\frac{a}{b}+1\right).\left(\frac{b}{c}+1\right).\left(\frac{c}{a}+1\right)=\left[\frac{-\left(b+c\right)}{b}+1\right].\left[\frac{-\left(a+c\right)}{c}+1\right].\left[\frac{-\left(a+b\right)}{a}+1\right]\)
\(M=\left(-\frac{c}{b}\right).\left(-\frac{a}{c}\right).\left(-\frac{b}{a}\right)=-1\)
Vậy M=8 hay M=-1
\(M=\frac{3}{1^22^2}+\frac{5}{2^23^2}+\frac{7}{3^24^2}+...+\frac{4019}{2009^22010^2}\)
\(M=\frac{2^2-1^2}{1^22^2}+\frac{3^2-2^2}{2^23^2}+\frac{4^2-3^2}{3^24^2}+...+\frac{2010^2-2009^2}{2009^22010^2}\)
\(M=\frac{2^2}{1^22^2}-\frac{1^2}{1^22^2}+\frac{3^2}{2^23^2}-\frac{2^2}{2^23^2}+\frac{4^2}{3^24^2}-\frac{3^2}{3^24^2}+...+\frac{2010^2}{2009^22010^2}-\frac{2009^2}{2009^22010^2}\)
\(M=\frac{1}{1^2}-\frac{1}{2^2}+\frac{1}{2^2}-\frac{1}{3^2}+\frac{1}{3^2}-\frac{1}{4^2}+...+\frac{1}{2009^2}-\frac{1}{2010^2}\)
\(M=1-\frac{1}{2010^2}< 1\)
Vậy \(M< 1\)
Chúc bạn học tốt ~
\(M=2^{2010}-\left(2^{2009}+2^{2008}+...+2^1+2^0\right)\)
\(2^{2010}-M=2^{2009}+2^{2008}+...+2^1+2^0\)
\(2\left(2^{2010}-M\right)=2^1+2^2+....+2^{2009}+2^{2010}\)
\(2\left(2^{2010}-M\right)-\left(2^{2010}-M\right)=\left(2^1+2^2+....+2^{2009}+2^{2010}\right)-\left(2^0+2^1+...+2^{2008}+2^{2009}\right)\)
\(2^{2010}-M=2^{2010}-1\)
\(M=2^{2010}-2^{2010}+1\)
\(M=1\)
M=22010-(22009+22008+22007+...+21+20)
M=22010-22009-22008-22007-...-21-20
=>2M=22011-22010-22009-22008-...-22-21
=>2M-M=22011-22010-22009-22008-...-22-21-(22010-22009-22008-22007-...-21-20)
=>M=22011-22010-22009-22008-...-22-21-22010+22009+22008+22007+...+21+20
=22011-22010-22010+20
=22011-2.22010+1
=22011-22011+1
=1
Vậy M=1