\(\dfrac{13}{17}< \dfrac{30}{34}\)                                        \(\dfrac{9}{8}>\dfrac{5}{7}\) 

 \(\dfrac{15}{7}< \dfrac{8}{3}\)                                        \(\dfrac{5}{7}< \dfrac{7}{5}\)                     

\(\dfrac{16}{20}=\dfrac{4}{5}\)

a. Ta có:

\(\frac{33}{34}=1-\frac{1}{34}\)

\(\frac{34}{35}=1-\frac{1}{35}\)

Do \(\frac{1}{34}>\frac{1}{35}\Rightarrow1-\frac{1}{34}< 1-\frac{1}{35}\)

\(\Leftrightarrow\frac{33}{34}< \frac{34}{35}\)

\(\Rightarrow\frac{-33}{34}>\frac{-34}{35}.\)

Ta có : 

\(1-\frac{1}{34}=\frac{33}{34}\)

\(1-\frac{1}{35}=\frac{34}{35}\)

Do \(\frac{1}{34}>\frac{1}{35}\)

\(\Rightarrow1-\frac{1}{34}< 1-\frac{1}{35}\)

\(\Rightarrow\frac{33}{34}< \frac{34}{35}\)

\(\Rightarrow\frac{-33}{34}>-\frac{34}{35}\)

Vậy \(-\frac{33}{34}>-\frac{34}{35}\)

~ Ủng hộ nhé 

\(\frac{-15}{-34}=\frac{15}{34}\)

\(\Rightarrow\frac{15}{34}>\frac{-9}{315}\)

Chúc bn hok tốt!!!

bằng 28 bn nhé

a ) − 1 < 1 ; b ) 9 15 > 7 15 ; c ) − 1 2 > − 7 12 ; d ) 71 20 < 4

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}

a: \(\dfrac{4}{9}=\dfrac{4\cdot2}{9\cdot2}=\dfrac{8}{18}< \dfrac{13}{18}\)

b: 34/-4=-8,5

Ta có: 8,5<8,6

=>-8,5>-8,6

=>\(\dfrac{34}{-4}>-8,6\)

c: \(\dfrac{2021}{2022}=1-\dfrac{1}{2022}\)

\(\dfrac{2022}{2023}=1-\dfrac{1}{2023}\)

Ta có: 2022<2023

=>\(\dfrac{1}{2022}>\dfrac{1}{2023}\)

=>\(-\dfrac{1}{2022}< -\dfrac{1}{2023}\)

=>\(-\dfrac{1}{2022}+1< -\dfrac{1}{2023}+1\)

=>\(\dfrac{2021}{2022}< \dfrac{2022}{2023}\)

34/-4=-8,5 là sao v

23/7>34/11

\(\frac{23}{57}\)> \(\frac{34}{11}\) nha