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

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 \(10^{30}< 2^{100}\)

\(27^{11}=3^{33};81^8=3^{32}\)

\(27^{11}>81^8\)

\(5^{23}=5.5^{22}

a/

\(27^{81}=\left(3^3\right)^{81}=3^{241}\)

\(81^{27}=\left(3^4\right)^{27}=3^{108}\)

\(\Rightarrow27^{81}=3^{241}>3^{108}=81^{27}\)

b/

\(5^{60}=\left(5^3\right)^{20}=125^{20}\)

\(7^{40}=\left(7^2\right)^{20}=49^{20}\)

\(\Rightarrow5^{60}=125^{20}>49^{20}=7^{40}\)

c/

\(11^{102}=\left(11^2\right)^{51}=121^{51}>121^{50}>99^{50}\)

Ta có: 27¹¹ = (3³)¹¹ = 3³³

81⁵ = (3⁴)⁵ = 3²⁰

Vì 33 > 20 => 3³³ > 3²⁰ => 27¹¹ > 81⁵

a) 27¹¹ và 81⁸

\(27^{11}=\left(3^3\right)^{11}=3^{3.11}=3^{33}\)

\(81^8=\left(3^4\right)^8=3^{4.8}=3^{32}\)

Vì 3³³ > 3³² ⇒ 27¹¹ >81⁸

b) 5²³ và 6 . 5²²

\(5^{23}=5^{22}.5\)

Vì 5²² . 5 < 6 . 5²² ⇒ 5²³ < 6 . 5²²

Chứng tỏ (a + 2021) - (a + 222) là bội của 2 a thuộc N

16¹⁹ và 8²⁵

ta có:

16¹⁹=(2⁴)¹⁹=2⁷⁶

8²⁵=(2³)²⁵=2⁷⁵

Vì 2⁷⁶> 2⁷⁵ => 16¹⁹>8²⁵

     27¹¹ và 81⁸

Ta có:

27¹¹=(3³)¹¹=3³³

81⁸=(3⁴)⁸=3³²

Vì 3³³>3³² => 27¹¹>81⁸

      625⁵ và 125⁷

ta có: 

625⁵=(5⁴)⁵=5²⁰

125⁷=(5³)⁷=5²¹

vì 5²⁰<5²¹

=>625⁵<125⁷

            5³⁶ và 11²⁴

Ta có:

5³⁶=(5³)¹²=125¹²

11²⁴=(11²)¹²=121¹²

Vì 125¹²>121¹² 

=>5³⁶>11²⁴

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

\(27^{13}=\left(3^3\right)^{13}=3^{39}\)

\(81^9=\left(3^4\right)^9=3^{36}\)

Do \(3^{39}>3^{36}\)

\(\Rightarrow27^{13}>81^9\)

27¹³ = 3³⁹

81⁹ = 3³⁶

Vì 3³⁹ > 3³⁶ nên 27¹³ > 81⁹

\(27^{13}=\left(3^3\right)^{13}=3^{39}\)

\(81^9=\left(3^4\right)^9=3^{36}\)

\(3^{39}>3^{36}\)

\(\Rightarrow27^{13}>81^9\)