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Ta có: 291 > 290 = (25)18 = 3218
535 < 536 = (52)18 = 2518.
Vì 32 > 25 nên 3218 > 2518, do đó ta có : 291 > 3218 > 2518 > 535.
Vậy 291 > 535.
![](https://rs.olm.vn/images/avt/0.png?1311)
`2^{91}=(2^{13})^{7}=8192^{7}`
`5^{35}=(5^{5})^{7}=3125^{7}`
Vì `8192^{7}>3125^{7}`
`->2^{91}>5^{35}`
\(2^{91}=\left(2^{13}\right)^7=8192^7\)
\(5^{35}=\left(5^5\right)^7=3125^7\)
Mà \(8192^7>3125^7\Rightarrow2^{91}>5^{35}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(1,\\ a,2^x=16=2^4\Rightarrow x=4\\ b,3^{x+1}=9^x=3^{2x}\\ \Rightarrow x+1=2x\Rightarrow x=1\\ c,2^{3x+2}=4^{x+5}=2^{2\left(x+5\right)}\\ \Rightarrow3x+2=2x+10\Rightarrow x=8\\ d,3^{2x-1}=243=3^5\\ \Rightarrow2x-1=5\Rightarrow x=3\\ 2,\\ a,2^{225}=8^{75}< 9^{75}=3^{150}\\ b,2^{91}=\left(2^{13}\right)^7=8192^7>3125^7=\left(5^5\right)^7=5^{35}\\ c,99^{20}=\left(99^2\right)^{10}< \left(99\cdot101\right)^{10}=9999^{10}\\ 3,\\ a,12^8\cdot9^{12}=2^{16}\cdot3^8\cdot3^{24}=2^{16}\cdot3^{32}=\left(2\cdot3^2\right)^{16}=18^{16}\\ b,75^{20}=\left(3\cdot5^2\right)^{20}=3^{20}\cdot5^{40}=\left(3^{20}\cdot5^{10}\right)\cdot5^{30}=\left(3^2\cdot5\right)^{10}\cdot5^{30}=45^{10}\cdot5^{30}\)
Bài 1:
a) \(\Rightarrow2^x=2^4\Rightarrow x=4\)
b) \(\Rightarrow3^{x+1}=3^{2x}\Rightarrow x+1=2x\Rightarrow x=1\)
c) \(\Rightarrow2^{3x+2}=2^{2x+10}\Rightarrow3x+2=2x+10\Rightarrow x=8\)
d) \(\Rightarrow3^{2x-1}=3^5\Rightarrow2x-1=5\Rightarrow x=3\)
Bài 2:
a) \(2^{225}=\left(2^3\right)^{75}=8^{75}< 9^{75}=\left(3^2\right)^{75}=3^{150}\)
b) \(2^{91}=\left(2^{13}\right)^7=8192^7>3125^7=\left(5^5\right)^7=5^{35}\)
c) \(99^{20}=\left(99^2\right)^{10}=9801^{10}< 9999^{10}\)
Bài 3:
a) \(12^8.9^{12}=\left(4.3\right)^8.9^{12}=4^8.3^8.9^{12}=2^{16}.9^4.9^{12}=2^{16}.9^{16}=\left(2.9\right)^{16}=18^{16}\)
b) \(75^{20}=\left(75^2\right)^{10}=5625^{10}=\left(45.125\right)^{10}=45^{10}.125^{10}=45^{10}.5^{30}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a=\left[\left(-\dfrac{1}{2}\right)^5\right]^{107}=\left(-\dfrac{1}{32}\right)^{107}\)
\(b=\left[\left(-\dfrac{1}{3}\right)^3\right]^{107}=\left(-\dfrac{1}{27}\right)^{107}\)
mà -1/32>-1/27
nên a>b
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\dfrac{17}{20}< \dfrac{18}{20}< \dfrac{18}{19}\Rightarrow\dfrac{17}{20}< \dfrac{18}{19}\)
b) \(\dfrac{19}{18}>\dfrac{19+2024}{18+2024}=\dfrac{2023}{2022}\Rightarrow\dfrac{19}{18}>\dfrac{2023}{2022}\)
c) \(\dfrac{135}{175}=\dfrac{27}{35}\)
\(\dfrac{13}{17}=\dfrac{26}{34}< \dfrac{26+1}{34+1}=\dfrac{27}{35}\)
\(\Rightarrow\dfrac{13}{17}< \dfrac{135}{175}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 3012 = 212 . 312 . 512 ; 1018 = 212 . 512 . 26 . 56
Có 212 và 512 chung nên ta tiếp tục so sánh 312 và 26 . 56
Ta có: 312 = (32)6 = 96 ; 26 . 56 = 106
Vì 9 < 10 => 96 < 106
=> 3012 < 1018
b, 556 = (52)28 = 1028
Vì 28 > 24 => 556 > 1024
c, Ta có: 222555 = 111555 . 2555 = 111333 . 111222 . (25)111 = 111333 . 111222 . 32111
555222 = 111222 . 5222 = 111222 . (52)111 = 111222 . 25111
Do 32111 > 25111
=> 111333 . 32111 > 25111
=> 111333 . 111222 . 32111 > 111222 . 25111
=> 222555 > 555222
Mà 555222 > 535222
=> 222555 > 535222
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 8:
a) \(2^{225}=\left(2^3\right)^{75}=8^{75}\)
\(3^{150}=\left(3^2\right)^{75}=9^{75}\)
Vì \(8^{75}< 9^{75}\Rightarrow2^{225}< 3^{150}\)
b) \(2^{91}=\left(2^{13}\right)^7=8192^7\)
\(5^{35}=\left(5^5\right)^7=3125^7\)
Vì \(8192^7>3125^7\Rightarrow2^{91}>5^{35}\)
c) \(99^{20}=\left(99^2\right)^{10}=9801^{10}< 9999^{10}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài dễ mà you ko tự suy nghĩ được, đúng là lười suy nghĩ
a) 2561=(52)61=52.61=5122
Vì 122>120 nên 5122>5120 hay 2561>5120
b) 1680 = (42)80= 42.80=4160
Vì 160>65 nên 4160>465 hay 1680>465
Mấy câu khác tự làm
291 = (213)7
535 = ( 55)7
vì 213 > 55 => 291 > 535
291 = (213)7
535 = (55)7
Mà 213 > 55 => 291 > 535