\(\dfrac{72}{-73}=-0,98\)

\(\dfrac{98}{-99}=-0,98\)

\(\Rightarrow\dfrac{72}{-73}=\dfrac{98}{-99}\)

\(\dfrac{72}{-73}=\dfrac{-72}{73}=1-\dfrac{1}{73}\)

\(\dfrac{98}{-99}=\dfrac{-98}{99}=1-\dfrac{1}{99}\)

mà \(-\dfrac{1}{73}< -\dfrac{1}{99}\)

nên \(\dfrac{72}{-73}>\dfrac{98}{-99}\)

\(\dfrac{19}{19}\) = 1 < \(\dfrac{2005}{2004}\) vậy \(\dfrac{19}{19}\) < \(\dfrac{2005}{2004}\)

\(\dfrac{72}{73}\) = 1 - \(\dfrac{1}{73}\) 

\(\dfrac{98}{99}\) = 1 - \(\dfrac{1}{99}\)

Vì \(\dfrac{1}{73}\) > \(\dfrac{1}{99}\) nên \(\dfrac{72}{73}\) < \(\dfrac{98}{99}\) 

1) 19/19 < 2005/2004

2)72/73 > 98/99

Ta có: \(\frac{72}{73}>\frac{58}{73}\)

Mà: \(\frac{58}{73}>\frac{58}{99}\)

\(\Rightarrow\frac{72}{73}>\frac{58}{99}\)

a) 66 - 60 = 6     98 - 90 = 8     72 - 70 = 2

78 - 50 = 28     59 - 30 = 29     43 - 20 = 23

b) 58 - 4 = 54     67 - 7 = 60     99 - 1 = 98

58 - 8 = 50     67 - 5 = 62     99 - 9 = 90

a) 66 - 60 = 6     98 - 90 = 8     72 - 70 = 2

78 - 50 = 28     59 - 30 = 29     43 - 20 = 23

b) 58 - 4 = 54     67 - 7 = 60     99 - 1 = 98

58 - 8 = 50     67 - 5 = 62     99 - 9 = 90

Ta có :

\(\frac{72}{73}=\frac{72\times99}{73\times99}=\frac{7128}{7227}\)

\(\frac{98}{99}=\frac{98\times73}{99\times73}=\frac{7154}{7227}\)

Vì : 7128/7227 < 7154/7227

Nên : 72/73 < 98/99

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Ta có : \(\frac{69}{72}=\frac{23}{24};\frac{99}{102}=\frac{33}{34}\)

=> \(\frac{23}{24}+\frac{1}{24}=1\)\(;\)\(\frac{33}{34}+\frac{1}{34}=1\)

Mà\(\frac{1}{24}>\frac{1}{34}\)=>\(\frac{23}{24}< \frac{33}{34}\)

Vậy \(\frac{23}{24}< \frac{33}{34}\)