a ) \(\frac{33}{99};\frac{31}{93};\frac{30}{90};...\) Nói chung là \(\frac{x}{y}\) với \(y=3x\) và y là số có 2 chữ số.

b) \(\frac{8}{9};\frac{16}{18};\frac{24}{27}\)

\(\frac{32}{26}=\frac{64}{52}=\frac{96}{78}=\frac{16}{13}\)

ai đó giúp mình đi

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a, \(\frac{20}{48}\)=\(\frac{10}{24}\)=\(\frac{15}{36}\)=\(\frac{25}{60}\)=\(\frac{30}{72}\)=\(\frac{35}{84}=\frac{40}{96}\)

Còn phần b bye bye nhé

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các bạn giải chi tiết có đc ko

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1.7/11.

2.15/20 , 30/40 ,45/60 , 60/80 .

3.14/24 , 21/36 , 28/48 , 35/60 , 42/72 , 49/84 , 56/96.

1. 175175/275275=175/275=7/11

2. 75/100=15/20=30/40=45/60=60/80

3. 7/12=14/24=21/36=28/48=35/60=42/72=49/84=56/96

Đéo hiểu 

30 78

\(-\dfrac{21}{39}=\dfrac{-7}{13}=\dfrac{-42}{78}\)

-21/39=-7/13=-42/78