\(a,81^3=\left(9^2\right)^3=9^6\)

Vì \(9^{27}>9^6\) nên \(9^{27}>81^3\)

\(b,5^{14}=\left(5^2\right)^7=25^7\)

Vì \(25^7< 27^7\) nên \(5^{14}< 27^7\)

\(c,10^{30}=\left(10^3\right)^{10}=1000^{10}\)

\(2^{100}=\left(2^{10}\right)^{10}=1024^{10}\)

Vì \(1000^{10}< 1024^{10}\) nên \(10^{30}< 2^{100}\)

9^27=3^81 > 81^13  =3^52

5^14 =25^7 < 27^7 

10^30>9^30=3^90 > 2^100 (chú ý 3^3>2^4)

2^300=8^100 < 3^200=9^100

8^5=2^15=2^6.2^9 < 2^6.3^6  (chú ý 2^3<3^2)

3^450=(3^3)^150=27^150 > 5^300=(5^2)^150=25^150

a) 27⁵ và 243³

Ta có :

27⁵ = ( 3³ )⁵ = 3¹⁵

243³ = ( 3⁵ )³ = 3¹⁵

Vì 3¹⁵ = 3¹⁵ Nên 27⁵ = 243³

b) 2³⁰⁰ và 3²⁰⁰

Ta có :

2³⁰⁰ = ( 2³ )¹⁰⁰ = 8¹⁰⁰

3²⁰⁰ = ( 3² )¹⁰⁰ = 9¹⁰⁰

Vì 8¹⁰⁰ < 9¹⁰⁰ Nên 2³⁰⁰ < 3²⁰⁰

c) 125⁵ và 25⁷

Ta có : 

125⁵ = ( 5³ )⁵ = 5¹⁵

25⁷ = ( 5² )⁷ = 5¹⁴

Vì 5¹⁵ > 5¹⁴ Nên 125⁵ > 27⁷

d) 9²⁰ và 27¹³

Ta có : 

9²⁰ = ( 3² )²⁰ = 3⁴⁰

27¹³ = ( 3³ )¹³ = 3³⁹

Vì 3⁴⁰ > 3³⁹ Nên 9²⁰ > 27¹³

e) 3⁵⁴ và 2⁸¹

Ta có : 

3⁵⁴ = ( 3² )²⁷ = 9²⁷

2⁸¹ = ( 2³ )²⁷ = 8²⁷

Vì 9²⁷ > 8²⁷ Nên 3⁵⁴ > 2⁸¹

g) 10³⁰ và 2¹⁰⁰

Ta có :

10³⁰ = ( 10³ )¹⁰ = 1000¹⁰

2¹⁰⁰ = ( 2¹⁰ )¹⁰ = 1024¹⁰

Vì 1000¹⁰ < 1024¹⁰ Nên 10³⁰ < 2¹⁰⁰

A/ 27^5 =243^3

B/2^300<3^200

C/125^5>25^7

D/9^20>27^13

E/3^54>2^81

G/10^30<2^100

Chắc chắn 100% 

a)9^20 và 27^13

9^20=(3^2)^20=3^40

27^13=(3^3)^13=3^39

vì 3^40 > 3^39 =>9^20>27^13

b)10^30 và 2^100

10^30=(10^3)^10=30^10

2^100=(2^10)^10=20^10

vì 30^10>20^0 => 10^30>2^100

c)125^5 và 25^7

125^5=(5^3)^5=5^15

25^7=(5^2)^7=5^14

vì 5^15>5^14 =>125^5>25^7

Ta có :

a) \(9^{20}=\left(3^2\right)^{20}=3^{40};27^{13}=\left(3^3\right)^{13}=3^{39}\)

Vì \(3^{40}>3^{39}\Rightarrow9^{20}>27^{13}\)

Vậy \(9^{20}>27^{13}\)

Bài 4:

\(a,2^{30}=\left(2^3\right)^{10}=8^{10};3^{20}=\left(3^2\right)^{10}=9^{10}\\ Vì:8^{10}< 9^{10}\left(Vì:8< 9\right)\Rightarrow2^{30}< 3^{20}\\ b,9^{10}.27^5=\left(3^2\right)^{10}.\left(3^3\right)^5=3^{20}.3^{15}=3^{35}\\ 243^7=\left(3^5\right)^7=3^{35}\\ Vì:3^{35}=3^{35}\Rightarrow243^7=9^{10}.27^5\)

Bài 5:

100< 5^2x-3 < 59

Đề vầy hả em?

a.<

b.=

c=

d.<

\(1,\\ a,\Leftrightarrow4^{5-x}=4^2\Leftrightarrow5-x=2\Leftrightarrow x=3\\ b,\Leftrightarrow\left[{}\begin{matrix}x-1=5\\x-1=-5\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=6\\x=-4\end{matrix}\right.\\ c,\Leftrightarrow2x+1=3\Leftrightarrow x=2\\ 2,\\ a,3^{100}=\left(3^2\right)^{50}=9^{50}\\ b,2^{98}=\left(2^2\right)^{49}=4^{49}< 9^{49}\\ c,5^{30}=5^{29}\cdot5< 6\cdot5^{29}\\ d,3^{30}=\left(3^3\right)^{10}=27^{10}>8^{10}\\ 4,\\ a,\Leftrightarrow5\left(x-10\right)=10\\ \Leftrightarrow x-10=2\Leftrightarrow x=12\\ b,\Leftrightarrow3\left(70-x\right)+5=92\\ \Leftrightarrow3\left(70-x\right)=87\\ \Leftrightarrow70-x=29\\ \Leftrightarrow x=41\\ c,\Leftrightarrow16+x-5=315-230=85\\ \Leftrightarrow x=74\\ d,\Leftrightarrow2^x-5+74=707:\left(16-9\right)=707:7=101\\ \Leftrightarrow2^x=32=2^5\\ \Leftrightarrow x=5\)

\(\dfrac{11}{10}< \dfrac{9}{30}\)

\(\dfrac{6}{7}>\dfrac{3}{5}\)

\(\dfrac{25}{100}< \dfrac{3}{4}\)

a \(\dfrac{11}{10}>\dfrac{3}{10}\)

b \(\dfrac{30}{35}>\dfrac{21}{35}\)

c \(\dfrac{1}{4}< \dfrac{3}{4}\)

a, \(\dfrac{11}{10}< \dfrac{9}{30}\)

b, \(\dfrac{6}{7}>\dfrac{3}{5}\)

c, \(\dfrac{25}{100}< \dfrac{3}{4}\)

Đổi \(9^{30}=3^{2^{30}}=3^{60}\); \(27^{21}=3^{3^{21}}=3^{63}\)

Vì \(3^{63}>3^{60}\Rightarrow27^{21}>9^{30}\)