63 ^15 = 60 ^ 5*3 = (65^5 ) ^3 = 992436543^3

34^18 = 34 ^6*3 = (34^6)^3 = 1544804416^3

vì  992436543^3 < 1544804416^3

=> 63 ^ 15 < 34 ^ 18 

k mk nha mn 

Ta có:

 \(63^{15}< 64^{15}\)

\(=\left(2^6\right)^{15}\)

\(=2^{90}\)

\(=\left(2^5\right)^{18}\)

\(=32^{18}< 34^{18}\)

\(\Rightarrow63^{15}< 34^{18}\)

63=3^2.7 

mà bạn

a, \(\dfrac{18}{24}\) = \(\dfrac{3}{4}\)                            \(\dfrac{15}{25}\) = \(\dfrac{3}{5}\) 

     \(\dfrac{3}{4}\)  >  \(\dfrac{3}{5}\) vậy \(\dfrac{18}{24}\) > \(\dfrac{15}{25}\)

b, \(\dfrac{21}{15}\) = \(\dfrac{7}{5}\)                            \(\dfrac{28}{24}\) = \(\dfrac{7}{6}\)

      \(\dfrac{7}{5}\)  >  \(\dfrac{7}{6}\) vậy \(\dfrac{21}{15}\)  >  \(\dfrac{28}{24}\) 

ᵃ, ᵗᵃ ʳᵘ́ᵗ ᵍᵒ̣ⁿ :\(\dfrac{18}{24}=\dfrac{3}{4}\) ;

 ᵗᵃ ʳᵘ́ᵗ ᵍᵒ̣ⁿ :\(\dfrac{15}{25}=\dfrac{3}{5}\)

Vì \(\dfrac{3}{4}>\dfrac{3}{5}\\ \Rightarrow\dfrac{18}{24}>\dfrac{15}{25}\)

ᵇ, ᵗᵃ ʳᵘ́ᵗ ᵍᵒ̣ⁿ :\(\dfrac{21}{15}=\dfrac{7}{5}\\ \dfrac{28}{24}=\dfrac{7}{6}\)

Vì \(\dfrac{7}{5}>\dfrac{7}{6}\\ \Rightarrow\dfrac{21}{15}>\dfrac{28}{24}\)

mk ko biết giai thông cảm

63^15<34^18

32 mũ 18 = 64 mũ 9

Vì 15 > 9 nên 63 mũ 15 > 64 mũ 9

thế thôi!

63¹⁵ = 63^5.3 = ( 63⁵ )³ = 992 436 543³

34¹⁸ = 34^6.3 = ( 34⁶ )³ = 1 544 804 416 ³

Vì : 992 436 543³ < 1 544 804 416³

Nên : 63¹⁵ < 26¹⁸

83⁹ = 83^3.3 = ( 83³ )³ = 571 787³

26¹² = 26^{4.3 =} ( 26⁴ )³ = 456 978³

Vì : 571 787³ > 456 978³

Nên : 83⁹ > 26¹²

63¹⁵ <64¹⁵

34¹⁸<36¹⁸

64¹⁵=8³⁰ =(2.4)³⁰

36¹⁸=6³⁶

^{sau đó các bạn tự giải}

63 ^15 = 63^ 5.3 = ( 63^ 5 ) 3 = 992 436 543^ 3

34 ^18 = 34^ 6.3 = ( 34^ 6 ) 3 = 1 544 804 416 ^3

Vì : 992 436 543^ 3 < 1 544 804 416^ 3

Nên : 63 ^15 < 34^ 18 

63 mũ 15 >34 mũ 18

thanks