a: 5/3=10/6=25/15=35/21

b: 5/7=35/49

6/15=12/30

4/5=16/20

c: 6=216/36=324/54=108/18

a)\(\dfrac{5}{3}=\dfrac{10}{6}=\dfrac{25}{15}=\dfrac{35}{21}\)

b)\(\dfrac{5}{7}=\dfrac{35}{49};\dfrac{6}{15}=\dfrac{12}{30};\dfrac{4}{5}=\dfrac{16}{20}\)

c) \(6=\dfrac{216}{36}=\dfrac{324}{54}=\dfrac{108}{18}\)

\(\dfrac{12}{4};\dfrac{15}{5}\)

12/4; 15/5 nhé

\(\dfrac{12}{4};\dfrac{15}{5}\)

Ta có: 

15 = 15 1 = 15 × 3 1 × 3 = 45 3 15 = 15 1 = 15 × 5 1 × 5 = 75 5 15 = 15 1 = 15 × 10 1 × 10 = 150 10

14/2

21/3

\(\dfrac{18}{6}=18:6\)

\(\dfrac{50}{10}=50:10\)

\(\dfrac{15}{15}=15:15\)

\(\dfrac{12}{24}=12:24\)

a) Viết thương của mỗi phép chia sau dưới dạng phân số (theo mẫu).

13 : 17 = \(\dfrac{13}{17}\)

 21 : 11 = \(\dfrac{22}{11}\)      

40 : 51 = \(\dfrac{40}{51}\)       

72 : 25 = \(\dfrac{72}{25}\)

b) Viết (theo mẫu)

34 : 17 = \(\dfrac{34}{17}\) = 2

20 : 5 =\(\dfrac{20}{5}\) = 4

42 : 42 = \(\dfrac{42}{42}\) = 1         

0 : 6 = \(\dfrac{0}{6}\) = 0

a)

 \(3:8=\dfrac{3}{8}\)

\(8:9=\dfrac{8}{9}\)

\(4:7=\dfrac{4}{7}\)

\(12:5=\dfrac{12}{5}\)

b)

 \(7=\dfrac{7}{1}\)

\(9=\dfrac{9}{1}\)

\(21=\dfrac{21}{1}\)

\(40=\dfrac{40}{1}\)

\(4=\frac{5}{\frac{5}{4}}\)        ; \(4=\frac{8}{2}\)         ;\(4=\frac{12}{3}\)

\(\frac{20}{5};\frac{32}{8};\frac{48}{12}.\)

k mình nha! Mình trả lời đầu tiên đó!

Sorry!Mình đọc nhầm!!!

\(4=\frac{20}{5};4=\frac{32}{8};4=\frac{48}{12}\)