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ta có: B=2010.2010
Lại có A=2009.(2010+1); B=(2009+1).2010
và A=2009.2010+2009 ; B=2009.2010+2010
Vì 2009.2010+2009<2009.2010+2010 nên A<B
giải:
A:2009.2011=4040099
B:2010^2=4040100
=>:A<B(mình chắc chắn luôn)
Ta có : A=2009.2011=2009.(2010+1)=2009.2010+2009
B=2010^2=2010.2010=(2009+1).2010=2009.2010+2010
Vì 2009<2010 => A<B.
A = 2009.2011 =2009.( 2010 +1) =2009.2010 + 2009
B = 20102 =(2009 +1).2010 = 2009.2010 + 2010
Vì 2009 < 2010
=> A < B
Làm ơn giúp mik vs. Help me, please
a) Ta có: \(10^{30}=\left(10^3\right)^{10}=1000^{10}\)
\(2^{100}=\left(2^{10}\right)^{10}=1024^{10}\)
Ta thấy 1024<1000 => \(1000^{10}< 1024^{10}\Leftrightarrow10^{30}< 2^{100}\)
b) Ta có 2009 x 2011 =(2010-1) x (2010+1) =\(2010^2-1\)
Thấy \(2010^2-1< 2010^2\)
=> \(2009\cdot2011< 2010^2\)
a) \(A=2^0+2^1+2^2+...+2^{2010}\)
\(\Rightarrow2A=2^1+2^2+2^3+...+2^{2011}\)
\(\Rightarrow2A-A=\left(2^1+2^2+2^3+...+2^{2011}\right)-\left(2^0+2^1+2^2+...+2^{2010}\right)\)
\(\Rightarrow A=2^{2011}-2^0\)
\(\Rightarrow A=2^{2011}-1\)
Vì \(2^{2011}-1=2^{2011}-1\) nên \(A=B\)
Vậy A = B
b) Ta có: \(A=2009.2011=2009.\left(2010+1\right)=2009.2010+2009\)
\(B=2010^2=\left(2009+1\right).2010=2009.2010+2010\)
Vì \(2009.2010+2009< 2009.2010+2010\) nên A < B
Vậy A < B
\(A=2^0+2^1+2^2+2^3+....+2^{2010}\)
\(2.A=2\left(2^0+2^1+2^2+2^3+....+2^{2010}\right)\)
\(2.A=2.2^0+2.2+2.2^2+2.2^3+....+2.2^{2010}\)
\(2.A=2+2^2+2^3+2^4+....+2^{2011}\)
\(2A-A=\left(2+2^2+2^3+2^4+....+2^{2011}\right)-\left(2^0+2^1+2^2+2^3+....+2^{2010}\right)\)
\(A=\left(2-2^1\right)+\left(2^2-2^2\right)+\left(2^3-2^3\right)+....+\left(2^{2010}-2^{2010}\right)+2^{2011}-2^0\)
\(A=0+0+0+....+0+2^{2011}-2^0\)
\(A=2^{2011}-2^0\)
\(A=2^{2011}-1\)
Vì \(A=2^{2011}-1\) ; \(B=2^{2011}-1\)
\(=>A=B\)
Vậy \(A=B\)
b) \(A=2009.2001\)
\(A=\left(2010-1\right)\left(2010+1\right)\)
\(A=\left(2010-1\right).2010+\left(2010-1\right).1\)
\(A=2010.2010-2010.1+1.2010-1.1\)
\(A=2010^2-2010+2010-1\)
\(A=2010^2+0-1\)
\(A=2010^2-1\)
Vì \(A=2010^2-1\) ; \(B=2010^2\)
\(=>A< B\)
Vậy \(A< B\)
A = 2009 . 2011 = 4040099
B = 2010 . 2010 = 4040100
VÌ 4040100 > 4040099 nên A > B
=> A > B
A=2009.2011
=2009.(2010+1)
=2009.2010+2009
B=20102
=2010.2010
=2010.(2009+1)
=2010.2009+2010
Vì 2009.2010+2009 < 2010.2009+2010 nên 2009.2011 < 20102