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\(A=2+2^2+2^3+2^4+...+2^{99}+2^{100}\\ =\left(2+2^2\right)+\left(2^3+2^4\right)+...+\left(2^{99}+2^{100}\right)\\ =\left(2+2^2\right)+2^2\left(2+2^2\right)+...+2^{98}\left(2+2^2\right)\\ =6+2^2.6+...+2^{98}.6\\ =\left(1+2^2+...+2^{98}\right).6⋮6\left(đpcm\right)\)
\(A=2+2^2+2^3+2^4+...+2^{99}+2^{100}\)
\(=\left(2+2^2\right)+\left(2^3+2^4\right)+...+\left(2^{99}+2^{100}\right)\)
\(=6+2^2\left(2+2^2\right)+...+2^{98}\left(2+2^2\right)\)
\(=6\left(1+2^2+....+2^{98}\right)⋮6\)
Ta có :
\(B=4+2^2+2^3+2^4+...+2^{2016}\)
\(\Rightarrow\) \(B-4=2^2+2^3+2^4+...+2^{2016}\)
\(\Rightarrow\) \(2\left(B-4\right)=2^3+2^4+2^5+...+2^{2017}\)
\(\Rightarrow\) \(2\left(B-4\right)-\left(B-4\right)=B-4=2^{2017}-2^2\)
\(\Rightarrow\) \(B=2^{2017}-2^2+4=2^{2017}\)
\(\Rightarrow\) \(A=B=2^{2017}\)
Vậy \(A=B\)
\(\dfrac{5}{-6}=\dfrac{-55}{66};\dfrac{-10}{11}=\dfrac{-60}{66}\Rightarrow\dfrac{-55}{66}>\dfrac{-60}{66}\Rightarrow\dfrac{5}{-6}>\dfrac{-10}{11}\\ \dfrac{-3}{20}=\dfrac{-45}{300};\dfrac{2}{-15}=\dfrac{-40}{300}\Rightarrow\dfrac{-45}{300}< \dfrac{-40}{300}\Rightarrow\dfrac{-3}{20}< \dfrac{2}{-15}\\ -0,305>-0,36\)
\(^\circ\) \(\dfrac{5}{-6}\) và \(\dfrac{-10}{11}\)
Ta có \(:\)
\(\dfrac{5}{-6} = \dfrac{ 5 . 11 }{ -6 . 11 } = \dfrac{ 55 }{ -66} \)
\(\dfrac{-10}{11} = \dfrac{-10 . ( -6 )}{11.(-6)} = \dfrac{60}{-66}\)
Do \(55 < 60\)
\(=> \dfrac{55}{-66} > \dfrac{60}{-66}\)
Vậy \(\dfrac{55}{-66} > \dfrac{60}{-66}\)
Ta xét : \(B=\left(2017\right).2019=\left(2018-1\right)\left(2018+1\right)\)
\(B=2018.2018+2018-2018-1\)
\(B=2018.2018-1\)
Mà : \(A=2018.2018\)
\(Dođó:A>B\)
\(10^{30}=\left(10^3\right)^{10}=1000^{10};2^{100}=\left(2^{10}\right)^{10}=1024^{10}\)
mà 1000<1024
nên \(10^{30}< 2^{100}\)
\(32^{10}=\left(2^5\right)^{10}=2^{50};16^{15}=\left(2^4\right)^{15}=2^{60}\)
mà \(2^{50}< 2^{60}\)
nên \(32^{10}< 16^{15}\)
Ta có:
`10^30 = 10^(3.10) = (10^3)^10 = 1000^10`
`2^100 = 2^(10.10) = (2^10)^10 = 1024^10`
Mà `1024 > 1000 => 2^100 > 10^30`
-----------------------
Ta có:
`32^10 = (2^5)^10 = 2^(5.10) = 2^50`
`16^15 = (2^4)^15 = 2^(4.15) = 2^60`
Mà `50 < 60 => 32^10 < 16^15`