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Ta có:
\(3^{100}=\left(3^2\right)^{50}=9^{50}\)
Mà \(8^{50}< 9^{50}\)
Vậy \(8^{50}< 3^{100}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) ta có: \(2^{100}=\left(2^2\right)^{50}=4^{50}\) và 550
Vì 4 < 5 => 450 < 550
Vậy 2100 < 550
b) Ta có: \(4^{30}=\left(4^3\right)^{10}=64^{10}\)
\(8^{20}=\left(8^2\right)^{10}=64^{10}\)
Vì 64 = 64 => 6410 = 6410
Vậy 430 = 820
![](https://rs.olm.vn/images/avt/0.png?1311)
1) \(5^{199}< 5^{200}=25^{100}\)
\(3^{300}=27^{100}>25^{100}\)
\(\Rightarrow3^{300}>5^{199}\)
\(\Rightarrow\dfrac{1}{3^{300}}< \dfrac{1}{5^{199}}\)
2) a) \(107^{50}=\left(107^2\right)^{25}=11449^{25}\)
\(73^{75}=\left(73^3\right)^{25}=389017^{25}>11449^{25}\)
\(\Rightarrow107^{50}< 73^{75}\)
b) \(54^4< 5^{12}< 21^{12}\Rightarrow54^4< 21^{12}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(2^{100}=\left(2^2\right)^{50}\)
\(2^2=4< 5\)
\(2^{100}< 5^{50}\)
b) \(4^{30}=\left(4^3\right)^{10}\)
\(4^3=8^2\)
\(4^{30}=8^{20}\)
\(8^{20}=\left(8^2\right)^{10}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(-\dfrac{1}{4}\right)^8=\left(\dfrac{1}{4}\right)^8=\left(\dfrac{1}{2}\right)^{16}\)
\(\left(\dfrac{1}{8}\right)^5=\left(\dfrac{1}{2}\right)^{15}\)
mà 16>15
nên \(\left(-\dfrac{1}{4}\right)^8>\left(\dfrac{1}{8}\right)^5\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) Ta có :
\(27^{27}>27^{26}=\left(27^2\right)^{13}=729^{13}>243^{13}\)
\(\Rightarrow27^{27}>243^{13}\)
\(\Rightarrow-27^{27}< -243^{13}\)
\(\Rightarrow\left(-27\right)^{27}< \left(-243\right)^{13}\)
b) \(\left(\dfrac{1}{8}\right)^{25}>\left(\dfrac{1}{8}\right)^{26}=\left(\dfrac{1}{8^2}\right)^{13}=\left(\dfrac{1}{64}\right)^{13}>\left(\dfrac{1}{128}\right)^{13}\)
\(\Rightarrow\left(\dfrac{1}{8}\right)^{25}>\left(\dfrac{1}{128}\right)^{13}\)
\(\Rightarrow\left(-\dfrac{1}{8}\right)^{25}< \left(-\dfrac{1}{128}\right)^{13}\)
c) \(4^{50}=\left(4^5\right)^{10}=1024^{10}\)
\(8^{30}=\left(8^3\right)^{10}=512^{10}< 1024^{10}\)
\(\Rightarrow4^{50}>8^{30}\)
d) \(\left(\dfrac{1}{9}\right)^{17}< \left(\dfrac{1}{9}\right)^{12}< \left(\dfrac{1}{27}\right)^{12}\)
\(\Rightarrow\left(\dfrac{1}{9}\right)^{17}< \left(\dfrac{1}{27}\right)^{12}\)
Ta có :
850 = ( 23 )50 = 2150 > 2136 = ( 22 )68 = 468
=> 850 > 468
Vậy 850 > 468
850 >468 nha