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a, 2300 = (23)100 = 8100
3200 = (32)100 = 9100
Vì 8100 < 9100
=> 2300 < 3200
b, 220 = (25)4 = 324
312 = (33)4 = 274
Vì 324 > 274
=> 220 > 312
c, 2225 = (23)75 = 875
3150 = (32)75 = 975
Vì 875 < 975
=> 2225 < 3150
d, 2115 = (3.7)15 = 315.715
275.498 = (33)5.(72)8 = 315.716
Vì 315.715 < 315.716
=> 2115 < 275.498
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a) \(2^{225}\)= \(\left(2^3\right)^{75}\)= \(8^{75}\)
\(3^{150}\)= \(\left(3^2\right)^{75}\)= \(9^{75}\)
Vì \(8^{75}\)< \(9^{75}\)
Nên \(2^{225}\)< \(3^{150}\)
b) \(2^{332}\)< \(2^{333}\)= \(\left(2^3\right)^{11}\)= \(8^{11}\)
\(3^{223}\)> \(3^{222}\)= \(\left(3^2\right)^{11}\)= \(9^{11}\)
Vì \(8^{11}\)< \(9^{11}\)
Nên : \(2^{332}\)< \(3^{223}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(-3^{150}=-9^{75}\)
\(-2^{225}=-8^{75}\)
mà -9<-8
nên \(-3^{150}< -2^{225}\)
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a) \(2^{225}=\left(2^3\right)^{75}=8^{75}\)
\(3^{150}=\left(3^2\right)^{75}=9^{75}\)
vì 8 < 9 và 75 = 75
=> 875 < 975
=> 2225 < 3150
b) \(2^{91}>2^{90}=\left(2^5\right)^{18}=32^{18}>25^{18}=5^{36}>5^{35}\)
\(\Rightarrow2^{91}>5^{35}\)
c) \(5^{300}=\left(5^3\right)^{100}=125^{100}\)
\(3^{500}=\left(3^5\right)^{100}=243^{100}\)
Vì 125 < 243 mà 100 = 100
=> \(5^{300}< 3^{500}\)
Bài nì lp 6 lm nhìu rùi mà
Ta có:
+ 2225 = (23)75 = 875
3150 = (32)75 = 975
Vì 875 < 975
=> 3225 < 3150
+ 291 = (213)7 = 81927
535 = (55)7 = 31257
Vì 81927 > 31257
=> 291 > 535
+ 5300 = (53)100 = 125100
3500 = (35)100 = 243100
Vì 125100 < 243100
=> 5300 < 3500
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có:
\(2^3< 3^2\Rightarrow\left(2^3\right)^{75}< \left(3^2\right)^{75}\Rightarrow2^{225}< 3^{150}\Rightarrow2^{225}< 3^{151}\)
2^255=(2^3)^75=8^75
3^150=(3^2)675=9^75
vì 8<9
suy ra 2^255<3^150