a) \(\frac{2525}{2727}=\frac{2525:101}{2727:101}=\frac{25}{27}\)

\(\frac{135135}{500500}=\frac{135135:5005}{500500:5005}=\frac{27}{100}\)

\(\frac{153153153}{170170170}=\frac{153153153:17017017}{170170170:17017017}=\frac{9}{10}\)

b) \(\frac{7}{20}=\frac{7x6}{20x6}=\frac{42}{120}\)

  \(\frac{23}{30}=\frac{23x4}{30x4}=\frac{92}{120}\)

   \(\frac{34}{40}=\frac{34x3}{40x3}=\frac{102}{120}\)

    \(\frac{53}{60}=\frac{53x2}{60x2}=\frac{106}{120}\)

\(\dfrac{74}{100}=\dfrac{37}{50}\)
\(\dfrac{34}{51}=\dfrac{2}{3}\)
\(\dfrac{2525}{2727}=\dfrac{25}{27}\)
\(\dfrac{135135}{500500}=\dfrac{27}{100}\)

37/40=111/120

53/60=106/120

hinh nhu la ko

1a. chọn mẫu chung là 120,ta có

\(\frac{7}{30}=\frac{7.4}{30.4}=\frac{28}{120}\)

\(\frac{13}{60}=\frac{13.2}{60.2}=\frac{26}{120}\)

\(\frac{-9}{40}=\frac{-9.3}{40.3}=\frac{27}{120}\)

vậy....

1b. chon mẫu số chung là 60

\(\frac{3}{-20}=\frac{-3.3}{20.3}=-\frac{9}{60}\)

\(\frac{-11}{-30}=\frac{-11.\left(-2\right)}{-30.\left(-2\right)}=\frac{22}{60}\)

\(\frac{7}{15}=\frac{7.4}{15.4}=\frac{28}{60}\)

2a.\(\frac{-15}{90}=\frac{-1}{6};\frac{120}{600}=\frac{1}{5};\frac{-75}{150}=\frac{-1}{2}\)

mẫu chung 30

\(\frac{-1}{6}=-\frac{5}{30};\frac{1}{5}=\frac{16}{30};-\frac{1}{2}=\frac{-15}{30}\)

vậy...

???????????????????????????????????????????????????

Bài 1 : Các số đó là : \(\frac{35}{60};\frac{46}{60}\)

Bài 2 :

\(\frac{12}{30}=\frac{12:6}{30:6}=\frac{2}{5}\); \(\frac{20}{45}=\frac{20:5}{45:5}=\frac{4}{9}\)

\(\frac{28}{70}=\frac{28:14}{70:14}=\frac{2}{5}\) ; \(\frac{34}{51}=\frac{34:17}{51:17}=\frac{2}{3}\)

Bài 1: 

7/12=35/60

23/30=46/60

Bài 2: 

12/30=2/5

20/45=4/9

28/70=2/5

34/51=2/3

k mình nha!

7/24=35/120

3/40=9/120

1/30=4/120

11/60=22/120

k và kb vs mk nha

\(\frac{7}{24}=\frac{35}{120}\)

\(\frac{3}{40}=\frac{9}{120}\)

\(\frac{1}{30}=\frac{4}{120}\)

\(\frac{11}{60}=\frac{22}{120}\)

tích cho mik thì mik trả lời