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8:
\(A=\dfrac{20^{10}-1+2}{20^{10}-1}=1+\dfrac{2}{20^{10}-1}\)
\(B=\dfrac{20^{10}-3+2}{20^{10}-3}=1+\dfrac{2}{20^{10}-3}\)
mà 20^10-1>20^10-3
nên A<B
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\(3\times24^{10}\)
\(=3\times\left(2^3\times3\right)^{10}\)
\(=3\times3^{10}\times\left(2^3\right)^{10}\)
\(=3^{11}\times2^{30}\)
\(=3^{11}\times\left(2^2\right)^{15}\)
\(=3^{11}\times4^{15}\)
Vì \(3^{11}\)<\(4^{15}\left(3;4;11;15\inℕ\right)\)
Nên \(3^{11}\times4^{15}\)< \(4^{15}\times4^{15}=4^{30}\)
Do đó : \(3\times24^{10}\)< \(4^{30}\)
Vậy \(2^{30}+3^{30}+4^{30}\)> \(3\times24^{10}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
ta có : \(2^{30}=\left(2^3\right)^{10}=8^{10}\)
\(3^{20}=\left(3^2\right)^{10}=9^{10}\)
vì \(8< 9\Rightarrow2^{30}< 3^{20}\)
\(4^{15}=\left(4^3\right)^5=64^5\)
\(8^{10}=\left(8^2\right)^5=64^5\)
vì \(64=64\Rightarrow4^{15}=8^{10}\)
2 câu còn lại tương tự
![](https://rs.olm.vn/images/avt/0.png?1311)
qwertyuiopasdfghjklzxcvbnm
zehahahahahahahahhahahahahahahahahahahahahaha cái dcm
![](https://rs.olm.vn/images/avt/0.png?1311)
1024+3486784401+1.152921505.\(10^{18}\)và 3.6.340338097.\(10^{13}\)
1.152921508.\(10^{18}\) , 1.902101429.\(10^{14}\)
v
Chúc bạn hoc giỏi
Ta có :
\(3.24^{10}=3.\left(2^3.3\right)^{10}=3^{11}.2^{30}=3^{11}.4^{15}< 4^{15}.4^{15}=4^{30}\)
\(\Rightarrow2^{10}+3^{20}+4^{30}>3.24^{10}\)
Vậy \(2^{10}+3^{20}+4^{30}>3.24^{10}\)
_Chúc bạn học tốt_