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a: \(\dfrac{25}{26}=1-\dfrac{1}{26}\)

\(\dfrac{50}{51}=1-\dfrac{1}{51}\)

mà \(-\dfrac{1}{26}< -\dfrac{1}{51}\)

nên \(\dfrac{25}{26}< \dfrac{50}{51}\)

b: \(\dfrac{149}{157}=1-\dfrac{8}{157}\)

\(\dfrac{449}{457}=1-\dfrac{8}{457}\)

mà \(-\dfrac{8}{157}>-\dfrac{8}{457}\)

nên \(\dfrac{149}{157}>\dfrac{449}{457}\)

a) 12/37 < 19/54

b) 18/53 > 26/78

c)  13/79    <    34/204

d) 25/103   <   74/295

e)  58/63     <    36/55

g)  456/461   >     123/128

giải rõ cho mình dk ko

a) Ta có: 12/37<12/36=1/3 ; 19/54>19/57=1/3 => 12/37<19/54

b) Ta có: 18/53>18/54=1/3 ; 26/78=1/3 => 18/53>26/78

c) Ta có: 13/79<13/78=1/6 ; 34/204=1/6 => 13/79<34/204

d) Ta có: 25/103<25/100=1/4=74/296<74/295 => 25/103<74/295

e) Ta có: 58/63>54/63=6/7=36/42>36/55 => 58/63>36/55

g) Phần bù so với 1 của p/s 456/461 là: 1- 456/461= 5/461

    Phần bù so với 1 của p/s 123/128 là: 1- 123/128= 5/128 

    Vì 5/461< 5/128 nên 456/461>123/128  

a) \(\frac{29}{60}< \frac{1}{2}< \frac{15}{28}\)

b)\(\frac{13}{30}< \frac{1}{2}< \frac{23}{42}\)

c)\(\frac{13}{36}>\frac{1}{3}>\frac{14}{45}\)

d)\(\frac{1919}{9595}=\frac{1}{5}< \frac{11}{50}=\frac{1111}{5050}\)

chúc các bạn học tôt nhớ k đúng cho mình nha !!!!!!!!!!!!!!!!!!!!!!!!!!!!!

\(\frac{52}{21}\approx2,48\)

\(\frac{253}{213}\approx1,19\)

=> 52/21 > 253/213 

a: 58/63=3190/3465

36/55=2268/3465

=>58/63>36/55

b: 27/53=1998/3922

36/74=1908/3922

=>27/53>36/74

Ta co:

\(\frac{58}{89}< \frac{58}{87}=\frac{2}{3}=\frac{36}{54}< \frac{36}{53}\)

Hay :\(\frac{58}{89}< \frac{36}{53}hay\frac{36}{53}>\frac{58}{89}\)