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

never gonna give you up

never gonna let you down

never gonna run around

desert you

never gonna make you cry

never gonna say goodbye

never gonna tell a lie 

and hurt you :)

SOS

a)  − 1 2 > − 7 12

b)  71 20 < 4

a) 12/17 và 7/15

=>180/255 và 119/225

=>12/17<7/15

b)1999/2001 và 12/11

a) 

\(1-\frac{1998}{1999}=\frac{1}{1999}\)

\(1-\frac{1999}{2000}=\frac{1}{2000}\)

Vì \(\frac{1}{1999}>\frac{1}{2000}\)nên \(\frac{1998}{1999}< \frac{1999}{2000}\)

b) Ta có :

\(\frac{1999}{2001}< 1\)

\(\frac{12}{11}>1\)

Nên \(\frac{1999}{2001}< \frac{12}{11}\)

c) 

\(1-\frac{13}{27}=\frac{14}{27}\)

\(1-\frac{27}{41}=\frac{14}{41}\)

Vì \(\frac{14}{27}>\frac{14}{41}\)nên \(\frac{13}{27}< \frac{27}{41}\)

d) 

Ta có phân số trung gian là \(\frac{23}{45}\).

Ta có : \(\frac{23}{47}< \frac{23}{45}\) ; \(\frac{24}{45}>\frac{23}{45}\)

Nên \(\frac{23}{47}< \frac{24}{45}\)

có ai trả lời mik ko 

ai trả lời được mik liền

Ta có : \(1=\frac{1998}{1999}+\frac{1}{1999}\)

         \(1=\frac{1}{2000}+\frac{1999}{2000}\)

Mà \(\frac{1}{2000}< \frac{1}{1999}\)

Nên \(\frac{1999}{2000}>\frac{1998}{1999}\)

a. \(\dfrac{10}{21}>1\)

\(\dfrac{9}{23}< 1\)

\(\Rightarrow\dfrac{10}{21}>\dfrac{9}{23}\)

b. \(\dfrac{32}{33}>\dfrac{31}{33}>\dfrac{31}{34}\Rightarrow\dfrac{32}{33}>\dfrac{31}{34}\)

c. \(\dfrac{44}{47}< \dfrac{45}{47}< \dfrac{45}{46}\Rightarrow\dfrac{44}{47}< \dfrac{45}{46}\)

\(d.\dfrac{70}{117}< \dfrac{70}{115}=\dfrac{14}{23}\Rightarrow\dfrac{70}{117}< \dfrac{14}{23}< \dfrac{15}{23}\)

\(\Rightarrow\dfrac{70}{117}< \dfrac{15}{23}\)

. 17/23 lớn hơn

. 24/45 lớn hơn

.13/45 lớn hơn 

. 35/42 lớn hơn

. 35/30 lớn hơn

.47/92 lớn hơn

a/ 22/30=22x3/30x3=66/90>66/91

b/ 23/48<23/47<24/47