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

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

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

\(a,\\ Ta.có:\dfrac{16}{-19}< 0;\dfrac{15}{17}>0\\ \Rightarrow\dfrac{16}{-19}< \dfrac{15}{17}\\ b,\\ Ta.có:\dfrac{419}{-723}< 0;\dfrac{-697}{-313}>0\\ \Rightarrow\dfrac{419}{-723}< \dfrac{-697}{-313}\\ c,\dfrac{311}{256}>\dfrac{256}{256}=1;\dfrac{199}{293}< \dfrac{203}{203}=1\\ \Rightarrow\dfrac{311}{256}>\dfrac{199}{203}\)

Ta có : 

\(\frac{19}{60}< \frac{20}{60}=\frac{1}{3}\)

\(\frac{31}{90}>\frac{30}{90}=\frac{1}{3}\)

=> \(\frac{31}{90}>\frac{1}{3}>\frac{19}{60}\Rightarrow\frac{31}{90}>\frac{19}{60}\)

\(\frac{15}{13}\)> 1 

\(\frac{70}{117}\)< 1

=> \(\frac{15}{13}\)> \(\frac{70}{117}\)

k cho mk nha

lớn hơn

câu đó 

đáp án của nó là 

15/23 lớn hơn 70/117

chúc bạn học giỏi

15/23 lớn hơn 70/117 nha bạn

Ta có:

\(\frac{70}{117}\)<\(\frac{70}{115}\)=\(\frac{14}{23}\)=>\(\frac{70}{117}\)<\(\frac{14}{23}\)<\(\frac{15}{23}\)

=>\(\frac{70}{117}\)<\(\frac{15}{23}\)

\(\frac{15}{23}>\frac{70}{117}\)

a)  19 60 < 20 60 = 30 90 < 31 90

b)  15 23 > 14 23 = 70 115 > 70 117