a)

 \(3:8=\dfrac{3}{8}\)

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

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

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

b)

 \(7=\dfrac{7}{1}\)

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

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

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

$\frac{3}{7} = 3:7$  _;    $\frac{8}{{12}} = 8:12$       

$\frac{4}{9} = 4:9$   ;     $\frac{5}{6} = 5:6$

a) $6:7 = \frac{6}{7}$   ;   $7:9 = \frac{7}{9}$                                                

$5:4 = \frac{5}{4}$   ;     $11:4 = \frac{{11}}{4}$

b) $9:3 = \frac{9}{3} = 3$        

$12:6 = \frac{{12}}{6} = 2$                         

$24:8 = \frac{{24}}{8} = 3$

a) $\frac{1}{2}$ = 1 : 2      ;    $\frac{3}{4}$= 3 : 4                                                  

$\frac{3}{{10}} = 3:10$     ;    $\frac{{11}}{6} = 11:6$

b) Hình 1: Phân số $\frac{3}{3}$ = 1

Hình 2: Phân số $\frac{5}{5}$ = 1

Hình 3: Phân số $\frac{8}{8}$ = 1

1:4=1/4

3:5=3/5

1:4=\(\dfrac{1}{4}\) 

 3:5=\(\dfrac{3}{5}\)

1 : 4 = 1/4

3 : 5 = 3/5

3 : 7 =  3 7 ;  4∶9 =  4 9 ; 23∶6 =  23 6

25 : 100 =  25 100 ; 100∶33 =  100 33 ; 10∶31 =  10 31

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

Ta có: 14/15= 2/3: 5/7 hoặc 14/15= 2/5:3/7=7/3: 5/2=7/5:3/2

\(88:11=\dfrac{88}{11}=8;144:12=\dfrac{144}{12}=12;1078:14=\dfrac{1078}{14}=77;5545:123=\dfrac{5545}{123}=45\) dư 10

\(\dfrac{88}{11}\)=\(8\)

\(\dfrac{144}{12}\)=\(12\)

\(\dfrac{1078}{14}\)=\(77\)

\(\dfrac{5545}{123}\)=\(45.1\) \(hay\) \(45\)\((dư \) \(10)\)

88:11=88/11=8
144:12=144/12=12
1078:14=1078/14=77
5545:123=5545/123=45(dư10)